Q: Is 121,257 a Prime Number?
A: No, 121,257 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 121257 can be evenly divided by 1 3 9 27 81 243 499 1,497 4,491 13,473 40,419 and 121,257, with no remainder.
Since 121,257 cannot be divided by just 1 and 121,257, it is not a prime number.