Q: Is 991,021 a Prime Number?
A: No, 991,021 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 991021 can be evenly divided by 1 19 43 817 1,213 23,047 52,159 and 991,021, with no remainder.
Since 991,021 cannot be divided by just 1 and 991,021, it is not a prime number.