Q: Is 81,721 a Prime Number?
A: No, 81,721 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 81721 can be evenly divided by 1 71 1,151 and 81,721, with no remainder.
Since 81,721 cannot be divided by just 1 and 81,721, it is not a prime number.