Q: Is 121,591 a Prime Number?
A: Yes, 121,591 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 121591 can be evenly divided by 1 and 121,591, with no remainder.
Since 121,591 can be divided by just 1 and 121,591, it is a prime number.