Q: Is 128,420 a Prime Number?
A: No, 128,420 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 128420 can be evenly divided by 1 2 4 5 10 20 6,421 12,842 25,684 32,105 64,210 and 128,420, with no remainder.
Since 128,420 cannot be divided by just 1 and 128,420, it is not a prime number.