Q: Is 311,991 a Prime Number?
A: No, 311,991 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 311991 can be evenly divided by 1 3 103,997 and 311,991, with no remainder.
Since 311,991 cannot be divided by just 1 and 311,991, it is not a prime number.