Q: Is 255,721 a Prime Number?
A: No, 255,721 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 255721 can be evenly divided by 1 19 43 313 817 5,947 13,459 and 255,721, with no remainder.
Since 255,721 cannot be divided by just 1 and 255,721, it is not a prime number.