Because it has more than two factors whereas prime numbers have only two factors
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A is not a number. If A is replaced by a composite number, it will have a prime factorization. The p.f. of 36 is 2 x 2 x 3 x 3.
That group is the factors of 36.
4, 6, 8, 9, 12, 18, 24, 36, 72
25, 36, 49
A composite number has three or more factors.