Q: Is 2,157,021 a Prime Number?
A: No, 2,157,021 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 2157021 can be evenly divided by 1 3 9 61 183 549 3,929 11,787 35,361 239,669 719,007 and 2,157,021, with no remainder.
Since 2,157,021 cannot be divided by just 1 and 2,157,021, it is not a prime number.