Q: Is 721,618 a Prime Number?
A: No, 721,618 is 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 721618 can be evenly divided by 1 2 31 62 103 113 206 226 3,193 3,503 6,386 7,006 11,639 23,278 360,809 and 721,618, with no remainder.
Since 721,618 cannot be divided by just 1 and 721,618, it is not a prime number.