Q: Is 688,491 a Prime Number?
A: No, 688,491 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 688491 can be evenly divided by 1 3 9 227 337 681 1,011 2,043 3,033 76,499 229,497 and 688,491, with no remainder.
Since 688,491 cannot be divided by just 1 and 688,491, it is not a prime number.