Q: Is 4,221,321 a Prime Number?
A: No, 4,221,321 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 4221321 can be evenly divided by 1 3 13 17 39 51 221 663 6,367 19,101 82,771 108,239 248,313 324,717 1,407,107 and 4,221,321, with no remainder.
Since 4,221,321 cannot be divided by just 1 and 4,221,321, it is not a prime number.