Q: Is 128,457 a Prime Number?
A: No, 128,457 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 128457 can be evenly divided by 1 3 7 9 21 63 2,039 6,117 14,273 18,351 42,819 and 128,457, with no remainder.
Since 128,457 cannot be divided by just 1 and 128,457, it is not a prime number.