# Why isn't 57 a prime number?

A prime number is one who does not have any factor other than one and itself.

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57 is not a prime number because it has factors other than 1 and itself. Prime numbers are defined as natural numbers greater than 1 that have no positive divisors other than 1 and the number itself. When examining the factors of 57, we find that it can be evenly divided by 1, 3, 19, and 57. Since 57 has factors other than 1 and itself, it does not meet the criteria for being a prime number. Therefore, 57 is a composite number.

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