Q: Is 720,639 a Prime Number?
A: No, 720,639 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 720639 can be evenly divided by 1 3 9 80,071 240,213 and 720,639, with no remainder.
Since 720,639 cannot be divided by just 1 and 720,639, it is not a prime number.