Q: Is 491,631 a Prime Number?
A: No, 491,631 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 491631 can be evenly divided by 1 3 7 21 41 123 287 571 861 1,713 3,997 11,991 23,411 70,233 163,877 and 491,631, with no remainder.
Since 491,631 cannot be divided by just 1 and 491,631, it is not a prime number.