Q: Is 721,424 a Prime Number?
A: No, 721,424 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 721424 can be evenly divided by 1 2 4 8 11 16 22 44 88 176 4,099 8,198 16,396 32,792 45,089 65,584 90,178 180,356 360,712 and 721,424, with no remainder.
Since 721,424 cannot be divided by just 1 and 721,424, it is not a prime number.