Q: Is 321,553 a Prime Number?
A: Yes, 321,553 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 321553 can be evenly divided by 1 and 321,553, with no remainder.
Since 321,553 can be divided by just 1 and 321,553, it is a prime number.