Q: Is 3,999 a Prime Number?

A: No, 3,999 is not a prime number.

Why is 3,999 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 3999 can be evenly divided by 1 3 31 43 93 129 1,333 and 3,999, with no remainder.

Since 3,999 cannot be divided by just 1 and 3,999, it is not a prime number.

Number	3,997	3,998	4,000	4,001
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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