Q: Is 135,721 a Prime Number?
A: Yes, 135,721 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 135721 can be evenly divided by 1 and 135,721, with no remainder.
Since 135,721 can be divided by just 1 and 135,721, it is a prime number.