Q: Is 491,391 a Prime Number?
A: No, 491,391 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 491391 can be evenly divided by 1 3 9 71 213 639 769 2,307 6,921 54,599 163,797 and 491,391, with no remainder.
Since 491,391 cannot be divided by just 1 and 491,391, it is not a prime number.