Q: Is 538,721 a Prime Number?
A: Yes, 538,721 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 538721 can be evenly divided by 1 and 538,721, with no remainder.
Since 538,721 can be divided by just 1 and 538,721, it is a prime number.