Q: Is 121,781 a Prime Number?
A: No, 121,781 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 121781 can be evenly divided by 1 11 11,071 and 121,781, with no remainder.
Since 121,781 cannot be divided by just 1 and 121,781, it is not a prime number.