Q: Is 128,821 a Prime Number?
A: No, 128,821 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 128821 can be evenly divided by 1 7 11 49 77 239 539 1,673 2,629 11,711 18,403 and 128,821, with no remainder.
Since 128,821 cannot be divided by just 1 and 128,821, it is not a prime number.