15
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9 and 15 are composite numbers because they have more than two factors
15 is a composite number - it can be divided by 3 and 5. 11, 13, 17 and 19 are all prime numbers, not composite.
It is 15
It is a composite number: 442 = 2 x 13 x 17
221 is a composite number having the factors 1, 13, 17, and 221.