Q: Is 121,857 a Prime Number?
A: No, 121,857 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 121857 can be evenly divided by 1 3 151 269 453 807 40,619 and 121,857, with no remainder.
Since 121,857 cannot be divided by just 1 and 121,857, it is not a prime number.