Q: Is 721,090 a Prime Number?
A: No, 721,090 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 721090 can be evenly divided by 1 2 5 10 72,109 144,218 360,545 and 721,090, with no remainder.
Since 721,090 cannot be divided by just 1 and 721,090, it is not a prime number.