Q: Is 721,629 a Prime Number?
A: No, 721,629 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 721629 can be evenly divided by 1 3 9 27 59 81 151 177 453 531 1,359 1,593 4,077 4,779 8,909 12,231 26,727 80,181 240,543 and 721,629, with no remainder.
Since 721,629 cannot be divided by just 1 and 721,629, it is not a prime number.