17 is not a composite number, it is a Prime number because it has only two factors itself and one.
A composite number has more than two factors.
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289 is composite. 289 = 17 * 17 = 172
The number after 17 is 18.
17 is a prime number.
85 is a composite number because a number can equal it: 5 x 17 = 85
It is a composite number: 442 = 2 x 13 x 17