2 x 2 x 3 x 7 x 7 = 588, making it composite.
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A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
81 is not prime. Its prime factorization is 3x3x3x3.
139 is a prime number. Prime numbers have only one prime factor: the numbers themselves.
Any factor that isn't prime.
3 and 19