Q: Is 166,991 a Prime Number?
A: No, 166,991 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 166991 can be evenly divided by 1 11 17 19 47 187 209 323 517 799 893 3,553 8,789 9,823 15,181 and 166,991, with no remainder.
Since 166,991 cannot be divided by just 1 and 166,991, it is not a prime number.