The factors of 138 are:
2 x 69
3 x 46
6 x 23
So the prime numbers of 138 would be 3, and 23.
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138 is not prime. 138 = 2 * 3 * 23
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.