Q: Is 128,605 a Prime Number?
A: No, 128,605 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 128605 can be evenly divided by 1 5 17 85 89 289 445 1,445 1,513 7,565 25,721 and 128,605, with no remainder.
Since 128,605 cannot be divided by just 1 and 128,605, it is not a prime number.