Q: Is 521,431 a Prime Number?

A: No, 521,431 is not a prime number.

Why is 521,431 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 521431 can be evenly divided by 1 523 997 and 521,431, with no remainder.

Since 521,431 cannot be divided by just 1 and 521,431, it is not a prime number.

Number	521,429	521,430	521,432	521,433
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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