Q: Is 172,821 a Prime Number?

A: No, 172,821 is not a prime number.

Why is 172,821 not a prime number?

A prime number is a natural number, greater than one, that can only be divided by 1 and itself.

The number 172821 can be evenly divided by 1 3 11 33 5,237 15,711 57,607 and 172,821, with no remainder.

Since 172,821 cannot be divided by just 1 and 172,821, it is not a prime number.

Number	172,819	172,820	172,822	172,823
Prime?	no	no	no	no

All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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