Q: Is 121,821 a Prime Number?
A: No, 121,821 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 121821 can be evenly divided by 1 3 7 21 5,801 17,403 40,607 and 121,821, with no remainder.
Since 121,821 cannot be divided by just 1 and 121,821, it is not a prime number.