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75 is not a prime number as it is divisible by 3 and 5. Prime numbers are numbers that are only divisible by 1 and themselves.
It is 75.
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.
3 and 5 are the two prime factors of 75. 1 x 3 = 3 and 1 x 5 = 5
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