Q: Is 671,491 a Prime Number?
A: No, 671,491 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 671491 can be evenly divided by 1 31 21,661 and 671,491, with no remainder.
Since 671,491 cannot be divided by just 1 and 671,491, it is not a prime number.