Q: Is 256,420 a Prime Number?
A: No, 256,420 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 256420 can be evenly divided by 1 2 4 5 10 20 12,821 25,642 51,284 64,105 128,210 and 256,420, with no remainder.
Since 256,420 cannot be divided by just 1 and 256,420, it is not a prime number.