If that's -16x, that factors to (x - 8)(x - 8) or (x - 8)2
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No, 8 isn't a prime number. The prime factorization of 64 is 26
64 32,2 16,2,2 8,2,2,2 4,2,2,2,2 2,2,2,2,2,2
2 x 2 x 2 x 2 x 2 x 2 = 64 or 26 = 64
(x + 4)(x + 1)
The GCF of 56 and 64 is 8