It is composite because it is a positive integer greater than 1 which is not prime.
In other words it is composite because there are other positive integers, beyond 1 and the number itself (57), which will evenly divide into it. 57 also evenly divides by 3 and 19.
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57 is a Composite Number.
57 is composite.
57 is the only composite number is the list.
57
57 is a composite number with factors 3 and 19.