Well say the number was 10 you find the factors (1,2,5,10) then out of those numbers you pick the Prime number/s 2 and 10.
For 20 , the factors are 1,2,4,5,10 and 20 so the prime factors are 2, and 5 again
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There is not such a thing as a composite prime number. A prime number has exactly two factors. A composite number has more than two factors.
Well, the factors of a prime number is that they only have two factors.
Prime numbers have as factors the number 1 and their own number. Example: 37 is a prime number because its only factors are "1" and "37". If the prime number had further factors, it would no longer be prime.
A prime number has two factors: one and the number itself. A prime number does not have any proper factors.
Whether a number is a prime number or not is determined by its factors. It is a prime number if its only factors are 1 and itself.