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33 is a composite number. Other than itself and 1, its positive integer factors are 3 and 11.
319 is a composite number. Other than itself and 1, its positive integer factors are 11 and 29.
11 is a prime
187 divides by 11. A prime number has only 2 factors which are 1 and itself. Composite numbers are every other positive integer except 1 and 0. 1 and 0 are neither prime, nor composite.
11 is prime.