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composite

. 57 divided by 3 is 19. (Any number in which all the digits add up to equal a number divisible by 3 is divisible by 3. 5+7=12 which is divisible by 3.) And since 57 is divisible by more numbers than just 1 and itself it is a composite number.
57 is a composite number since it can be divided by 3.

57/3 = 19
Composite.

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10y ago

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