Q: Is 211,721 a Prime Number?
A: No, 211,721 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 211721 can be evenly divided by 1 193 1,097 and 211,721, with no remainder.
Since 211,721 cannot be divided by just 1 and 211,721, it is not a prime number.