Q: Is 20,509 a Prime Number?

A: Yes, 20,509 is a prime number.

Why is 20,509 a prime number?

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

The number 20509 can be evenly divided by 1 and 20,509, with no remainder.

Since 20,509 can be divided by just 1 and 20,509, it is a prime number.

Number	20,507	20,508	20,510	20,511
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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