1,3,5,15,25,75. 3 and 5 are prime.
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The prime numbers (factors) of 75 are: 3 and 5
3 and 5 are the two prime numbers which go into 75. In order to know what prime numbers go into any composite number then prime factorization of the number should be done. Let us consider the case of 75, its prime factorization is 3x5x5. As we can see there are three prime factors out of which two are distinct(3 and 5) so, 3 and 5 are the only prime factors.
I'm uncertain about what you mean by "relatively", but 75 and 99 are not prime. Factors of 75: 1, 3, 5, 15, 25 and 75 Factors of 99: 1, 9, 11 and 99
Each of the 25 prime numbers from 1 to 100 has exactly two factors, 1 and the number itself. The other 75 numbers from 1 to 100 are not prime numbers because none of them have exactly two factors.
The factors of 75 are: 1 3 5 15 25 75 The prime factors are: 3, 5