Q: Is 721,687 a Prime Number?
A: Yes, 721,687 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 721687 can be evenly divided by 1 and 721,687, with no remainder.
Since 721,687 can be divided by just 1 and 721,687, it is a prime number.