Q: Is 20,511 a Prime Number?

A: No, 20,511 is not a prime number.

Why is 20,511 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 20511 can be evenly divided by 1 3 9 43 53 129 159 387 477 2,279 6,837 and 20,511, with no remainder.

Since 20,511 cannot be divided by just 1 and 20,511, it is not a prime number.

Number	20,509	20,510	20,512	20,513
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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