Q: Is 721,604 a Prime Number?
A: No, 721,604 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 721604 can be evenly divided by 1 2 4 13 26 52 13,877 27,754 55,508 180,401 360,802 and 721,604, with no remainder.
Since 721,604 cannot be divided by just 1 and 721,604, it is not a prime number.