Q: Is 133,991 a Prime Number?
A: No, 133,991 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 133991 can be evenly divided by 1 11 13 143 937 10,307 12,181 and 133,991, with no remainder.
Since 133,991 cannot be divided by just 1 and 133,991, it is not a prime number.