1: Every number is a multiple of 1
2: The number ends in 0, 2, 4, 6 or 8
3: The sum of the digits is a multiple of 3
4: The last 2 digits are a multiple of 4
The 10s digit is even and the last digit is 0, 4 or 8
The 10s digit is odd and the last digit is 2 or 6
5: The number ends in 0 or 5
6: The number is a multiple of 2 and 3 at the same time
7: The difference between twice the last digit and the rest of the number is a multiple of 7
8: The last 3 digits are a multiple of 8
The 100s digit is even and the last 2 digits are a multiple of 8
The 100s digit is odd and the last 2 digits are 4 times an odd number
9: The sum of the digits is a multiple of 9
10: The number ends in 0
11: The difference between the last digit and the rest of the number is a multiple of 11
12: The number is a multiple of 3 and 4 at the same time
13: The sum of 4 times the last digit and the rest of the number is a multiple of 13
14: The number is a multiple of 2 and 7 at the same time
15: The number is a multiple of 3 and 5 at the same time
16: The last 4 digits are a multiple of 16
The 1,000s digit is even and the last 3 digits are a multiple of 16
The 1,000s digit is odd and the last 3 digits are 8 times an odd number
17: The difference between 5 times the last digit and the rest of the number is a multiple of 17
18: The number is a multiple of 2 and 9 at the same time
19: The sum of twice the last digit and the rest of the number is a multiple of 19
20: The number ends in 00, 20, 40, 60 or 80
21: The number is a multiple of 3 and 7 at the same time
22: The number is a multiple of 2 and 11 at the same time
23: The sum of 7 times the last digit and the rest of the number is a multiple of 23
24: The number is a multiple of 3 and 8 at the same time
25: The number ends in 00, 25, 50 or 75
26: The number is a multiple of 2 and 13 at the same time
27: The difference between 8 times the last digit and the rest of the number is a multiple of 27
28: The number is a multiple of 4 and 7 at the same time
29: The sum of thrice the last digit and the rest of the number is a multiple of 29
30: The number is a multiple of 3 and 10 at the same time
31: The difference between thrice the last digit and the rest of the number is a multiple of 31
32: The last 5 digits are a multiple of 32
The 10,000s digit is even and the last 4 digits are a multiple of 32
The 10,000s digit is odd and the last 4 digits are 16 times an odd number
33: The number is a multiple of 3 and 11 at the same time
34: The number is a multiple of 2 and 17 at the same time
35: The number is a multiple of 5 and 7 at the same time
36: The number is a multiple of 4 and 9 at the same time
37: The difference between 11 times the last digit and the rest of the number is a multiple of 37
38: The number is a multiple of 2 and 19 at the same time
39: The number is a multiple of 3 and 13 at the same time
40: The last 3 digits are a multiple of 40
The 100s digit is even and the last 2 digits are 00, 40 or 80
The 100s digit is odd and the last 2 digits are 20 or 60
41: The difference between 4 times the last digit and the rest of the number is a multiple of 41
42: The number is a multiple of 2, 3 and 7 at the same time
43: The sum of 13 times the last digit and the rest of the number is a multiple of 43
44: The number is a multiple of 4 and 11 at the same time
45: The number is a multiple of 5 and 9 at the same time
46: The number is a multiple of 2 and 23 at the same time
47: The difference between 14 times the last digit and the rest of the number is a multiple of 47
48: The number is a multiple of 3 and 16 at the same time
49: The sum of 5 times the last digit and the rest of the number is a multiple of 49
50: The number ends in 00 or 50
51: The number is a multiple of 3 and 17 at the same time
52: The number is a multiple of 4 and 13 at the same time
53: The sum of 16 times the last digit and the rest of the number is a multiple of 53
54: The number is a multiple of 2 and 27 at the same time
55: The number is a multiple of 5 and 11 at the same time
56: The number is a multiple of 7 and 8 at the same time
57: The number is a multiple of 3 and 19 at the same time
58: The number is a multiple of 2 and 29 at the same time
59: The sum of 6 times the last digit and the rest of the number is a multiple of 59
60: The number is a multiple of 3 and 20 at the same time
61: The difference between 6 times the last digit and the rest of the number is a multiple of 61
62: The number is a multiple of 2 and 31 at the same time
63: The number is a multiple of 7 and 9 at the same time
64: The last 6 digits are a multiple of 64
The 100,000s digit is even and the last 5 digits are a multiple of 64
The 100,000s digit is odd and the last 5 digits are 32 times an odd number
65: The number is a multiple of 5 and 13 at the same time
66: The number is a multiple of 2, 3 and 11 at the same time
67: The difference between 20 times the last digit and the rest of the number is a multiple of 67
68: The number is a multiple of 4 and 17 at the same time
69: The number is a multiple of 3 and 23 at the same time
70: The number is a multiple of 7 and 10 at the same time
71: The difference between 7 times the last digit and the rest of the number is a multiple of 71
72: The number is a multiple of 8 and 9 at the same time
73: The sum of 22 times the last digit and the rest of the number is a multiple of 73
74: The number is a multiple of 2 and 37 at the same time
75: The number is a multiple of 3 and 25 at the same time
76: The number is a multiple of 4 and 19 at the same time
77: The number is a multiple of 7 and 11 at the same time
78: The number is a multiple of 2, 3 and 13 at the same time
79: The sum of 8 times the last digit and the rest of the number is a multiple of 79
80: The last 4 digits are a multiple of 80
The 1,000s digit is even and the last 3 digits are a multiple of 80
The 1,000s digit is odd and the last 3 digits are 40 times an odd number
81: The difference between 8 times the last digit and the rest of the number is a multiple of 81
82: The number is a multiple of 2 and 41 at the same time
83: The sum of 25 times the last digit and the rest of the number is a multiple of 83
84: The number is a multiple of 3, 4 and 7 at the same time
85: The number is a multiple of 5 and 17 at the same time
86: The number is a multiple of 2 and 43 at the same time
87: The number is a multiple of 3 and 29 at the same time
88: The number is a multiple of 8 and 11 at the same time
89: The sum of 9 times the last digit and the rest of the number is a multiple of 89
90: The number is a multiple of 9 and 10 at the same time
91: The number is a multiple of 7 and 13 at the same time
92: The number is a multiple of 4 and 23 at the same time
93: The number is a multiple of 3 and 31 at the same time
94: The number is a multiple of 2 and 47 at the same time
95: The number is a multiple of 5 and 19 at the same time
96: The number is a multiple of 3 and 32 at the same time
97: The difference between 29 times the last digit and the rest of the number is a multiple of 97
98: The number is a multiple of 2 and 49 at the same time
99: The number is a multiple of 9 and 11 at the same time
100: The number ends in 00