Q: Is 128,511 a Prime Number?
A: No, 128,511 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 128511 can be evenly divided by 1 3 9 109 131 327 393 981 1,179 14,279 42,837 and 128,511, with no remainder.
Since 128,511 cannot be divided by just 1 and 128,511, it is not a prime number.