Both are ending by 5, then they can be divided by 5, thus they are not prime numbers
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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.
102
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
25 and 50 --------------- Any two (or more) numbers where the only common prime factor between the numbers is 5² eg 25 and any multiple of 25 eg 75 and 100 eg 200 and 275
Prime Factorization means multiples of prime numbers. For example take 150 number, 150=2*75 2*25*3 2*3*5*5 2,3 and are the prime numbers. We have to do this process until we get all prime numbers.