3 and 5 are co-prime. So every integer can be expressed as a linear combination of 3 and 5.
For example, 17 = (-1)*3 + 4*5
Since any integer can, any rational number can. That leave irrationals, which cannot.
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There are only two numbers that can be multiplied to make 15. These numbers are 3 and 5. This is true because 3*5 = 15
2 and 3 are prime numbers.
The numbers 1, 2 or 3 are such numbers.
if your using whole numbers, u can only use 3
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.