Q: Is 721,690 a Prime Number?
A: No, 721,690 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 721690 can be evenly divided by 1 2 5 10 72,169 144,338 360,845 and 721,690, with no remainder.
Since 721,690 cannot be divided by just 1 and 721,690, it is not a prime number.