# Why isn't 57 a prime number?

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At first glance

after all,

Why not

If you add the digits of

This means that

The nearest multiples of

There are

These are

As it is a product of two primes and above the normal times tables, we will not often have come across

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#### Explanation:

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

Hence,

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