Q: Is 128,587 a Prime Number?
A: No, 128,587 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 128587 can be evenly divided by 1 149 863 and 128,587, with no remainder.
Since 128,587 cannot be divided by just 1 and 128,587, it is not a prime number.