Q: Is 721,528 a Prime Number?
A: No, 721,528 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 721528 can be evenly divided by 1 2 4 8 90,191 180,382 360,764 and 721,528, with no remainder.
Since 721,528 cannot be divided by just 1 and 721,528, it is not a prime number.