Q: Is 256,421 a Prime Number?
A: No, 256,421 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 256421 can be evenly divided by 1 11 23,311 and 256,421, with no remainder.
Since 256,421 cannot be divided by just 1 and 256,421, it is not a prime number.