Q: Is 521,605 a Prime Number?

A: No, 521,605 is not a prime number.

Why is 521,605 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 521605 can be evenly divided by 1 5 7 35 49 245 2,129 10,645 14,903 74,515 104,321 and 521,605, with no remainder.

Since 521,605 cannot be divided by just 1 and 521,605, it is not a prime number.

Number	521,603	521,604	521,606	521,607
Prime?	yes	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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