Q: Is 121,521 a Prime Number?
A: No, 121,521 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 121521 can be evenly divided by 1 3 40,507 and 121,521, with no remainder.
Since 121,521 cannot be divided by just 1 and 121,521, it is not a prime number.