Q: Is 721,281 a Prime Number?
A: No, 721,281 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 721281 can be evenly divided by 1 3 11 33 121 363 1,987 5,961 21,857 65,571 240,427 and 721,281, with no remainder.
Since 721,281 cannot be divided by just 1 and 721,281, it is not a prime number.