Q: Is 3,221,721 a Prime Number?
A: No, 3,221,721 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 3221721 can be evenly divided by 1 3 9 17 27 51 153 459 7,019 21,057 63,171 119,323 189,513 357,969 1,073,907 and 3,221,721, with no remainder.
Since 3,221,721 cannot be divided by just 1 and 3,221,721, it is not a prime number.