Let’s find factors of all numbers from 1 to 100 and check whether they are prime or not.

 

Number Factors Prime or Composite
1 1 Neither prime nor composite
2 1, 2 Prime
3 1, 3 Prime
4 1, 2, 4 Composite
5 1, 5 Prime
6 1, 2, 3, 6 Composite
7 1, 7 Prime
8 1, 2, 4, 8 Composite
9 1, 3, 9 Composite
10 1, 2, 5, 10 Composite
11 1, 11 Prime
12 1, 2, 3, 4, 6, 12 Composite
13 1, 13 Prime
14 1, 2, 7, 14 Composite
15 1, 3, 5, 15 Composite
16 1, 2, 4, 8, 16 Composite
17 1, 17 Prime
18 1, 2, 3, 6, 9, 18 Composite
19 1, 19 Prime
20 1, 2, 4, 5, 10, 20 Composite
21 1, 3, 7, 21 Composite
22 1, 2, 11, 22 Composite
23 1, 23 Prime
24 1, 2, 3, 4, 6, 8, 12, 24 Composite
25 1, 5, 25 Composite
26 1, 2, 13, 26 Composite
27 1, 3, 9, 27 Composite
28 1, 2, 4, 7, 14, 28 Composite
29 1, 29 Prime
30 1, 2, 3, 5, 6, 10, 15, 30 Composite
31 1, 31 Prime
32 1, 2, 4, 8, 16, 32 Composite
33 1, 3, 11, 33 Composite
34 1, 2, 17, 34 Composite
35 1, 5, 7, 35 Composite
36 1, 2, 3, 4, 6, 9, 12, 18, 36 Composite
37 1, 37 Prime
38 1, 2, 19, 38 Composite
39 1, 3, 13, 39 Composite
40 1, 2, 4, 5, 8, 10, 20, 40 Composite
41 1, 41 Prime
42 1, 2, 3, 6, 7, 14, 21, 42 Composite
43 1, 43 Prime
44 1, 2, 4, 11, 22, 44 Composite
45 1, 3, 5, 9, 15, 45 Composite
46 1, 2, 23, 46 Composite
47 1, 47 Prime
48 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 Composite
49 1, 7, 49 Composite
50 1, 2, 5, 10, 25, 50 Composite
51 1, 3, 17, 51 Composite
52 1, 2, 4, 13, 26, 52 Composite
53 1, 53 Prime
54 1, 2, 3, 6, 9, 18, 27, 54 Composite
55 1, 5, 11, 55 Composite
56 1, 2, 4, 7, 8, 14, 28, 56 Composite
57 1, 3, 19, 57 Composite
58 1, 2, 29, 58 Composite
59 1, 59 Prime
60 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 Composite
61 1, 61 Prime
62 1, 2, 31, 62 Composite
63 1, 3, 7, 9, 21, 63 Composite
64 1, 2, 4, 8, 16, 32, 64 Composite
65 1, 5, 13, 65 Composite
66 1, 2, 3, 6, 11, 22, 33, 66 Composite
67 1, 67 Prime
68 1, 2, 4, 17, 34, 68 Composite
69 1, 3, 23, 69 Composite
70 1, 2, 5, 7, 10, 14, 35, 70 Composite
71 1, 71 Prime
72 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 Composite
73 1, 73 Prime
74 1, 2, 37, 74 Composite
75 1, 3, 5, 15, 25, 75 Composite
76 1, 2, 4, 19, 38, 76 Composite
77 1, 7, 11, 77 Composite
78 1, 2, 3, 6, 13, 26, 39, 78 Composite
79 1, 79 Prime
80 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 Composite
81 1, 3, 9, 27, 81 Composite
82 1, 2, 41, 82 Composite
83 1, 83 Prime
84 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 Composite
85 1, 5, 17, 85 Composite
86 1, 2, 43, 86 Composite
87 1, 3, 29, 87 Composite
88 1, 2, 4, 8, 11, 22, 44, 88 Composite
89 1, 89 Prime
90 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 Composite
91 1, 7, 13, 91 Composite
92 1, 2, 4, 23, 46, 92 Composite
93 1, 3, 31, 93 Composite
94 1, 2, 47, 94 Composite
95 1, 5, 19, 95 Composite
96 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96 Composite
97 1, 97 Prime
98 1, 2, 7, 14, 49, 98 Composite
99 1, 3, 9, 11, 33, 99 Composite
100 1, 2, 4, 5, 10, 20, 25, 50, 100 Composite

Inorder to find prime numbers from 1 to 100, we do not write factors of all of them.

We use another method - Check how to find Prime numbers from 1 to 100

  1. Chapter 3 Class 6 Playing with Numbers
  2. Concept wise
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CA Maninder Singh's photo - Expert in Practical Accounts, Taxation and Efiling
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 8 years. He provides courses for Practical Accounts, Taxation and Efiling at teachoo.com .