Q: Is 21,091 a Prime Number?
A: No, 21,091 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 21091 can be evenly divided by 1 7 23 131 161 917 3,013 and 21,091, with no remainder.
Since 21,091 cannot be divided by just 1 and 21,091, it is not a prime number.