They are: 1 and 5 because 5 is a Prime number which has only two factors
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factors: 1, 5, 103, 515prime factors: 5, 1031x5155x103
Factors: 1, 5, 101, 505 Prime factors: 5 * 101
The prime factors are: 5 x 5 x 5
3, 5 and 7 have 2 factors. 81, 625 and 2401 have 5 factors.
5 is a prime number having 1 and 5 as its only factors. It makes no difference to the factors of 5 if the digit 5 is in composite numbers.