If that's 7x9, then the factors are a 7 with 9 exes.
If that's 7 x 9, the factors of 63 are 1, 3, 7, 9, 21, 63
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a proper factor is a factor.
a factor bug is a factor
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.
Factors are divisors. A factor times a factor will equal a product.
If it does not factor properly then you cannot factor it.