Being divisible by numbers other than itself and 1 means it's not prime. It therefore is composite by definition.
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composite and square
16 is a composite number because it has at least one positive factor other than one or itself.
29 is prime, all the others in the list are composite.
13 is prime 75 = 3 x 25 and so on 16 = 2 x 8 and so on
The composite numbers between 11 and 19 are 12, 14, 15, 16 and 18