Q: Is 128,255 a Prime Number?
A: No, 128,255 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 128255 can be evenly divided by 1 5 113 227 565 1,135 25,651 and 128,255, with no remainder.
Since 128,255 cannot be divided by just 1 and 128,255, it is not a prime number.