Q: Is 721,671 a Prime Number?
A: No, 721,671 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 721671 can be evenly divided by 1 3 23 69 10,459 31,377 240,557 and 721,671, with no remainder.
Since 721,671 cannot be divided by just 1 and 721,671, it is not a prime number.