Q: Is 28,509 a Prime Number?

A: No, 28,509 is not a prime number.

Why is 28,509 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 28509 can be evenly divided by 1 3 13 17 39 43 51 129 221 559 663 731 1,677 2,193 9,503 and 28,509, with no remainder.

Since 28,509 cannot be divided by just 1 and 28,509, it is not a prime number.

Number	28,507	28,508	28,510	28,511
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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