1: 1
2: 1, 2
3: 1, 3
4: 1, 2, 4
5: 1, 5
6: 1, 2, 3, 6
7: 1, 7
8: 1, 2, 4, 8
9: 1, 3, 9
10: 1, 2, 5, 10
11: 1, 11
12: 1, 2, 3, 4, 6, 12
13: 1, 13
14: 1, 2, 7, 14
15: 1, 3, 5, 15
16: 1, 2, 4, 8, 16
17: 1, 17
18: 1, 2, 3, 6, 9, 18
19: 1, 19
20: 1, 2, 4, 5, 10, 20
21: 1, 3, 7, 21
22: 1, 2, 11, 22
23: 1, 23
24: 1, 2, 3, 4, 6, 8, 12, 24
25: 1, 5, 25
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If the question is about common factors, the answer is that these numbers are co-prime.
1, 5, 25 Circle the 5
The factors of 75 are 1, 3, 5, 15, 25 and 75. The prime factors are 3 and 5.
The factors of 325 are 1, 5, 13, 25, 65, and 325. 5 and 13 are prime.
25 is, 1 x 25 and 5 x 5 which makes 25 a composite number not a prime.