Q: Is 279,999 a Prime Number?

A: No, 279,999 is not a prime number.

Why is 279,999 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 279999 can be evenly divided by 1 3 9 53 159 477 587 1,761 5,283 31,111 93,333 and 279,999, with no remainder.

Since 279,999 cannot be divided by just 1 and 279,999, it is not a prime number.

Number	279,997	279,998	280,000	280,001
Prime?	no	no	no	yes

All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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