Q: Is 4,221,621 a Prime Number?
A: No, 4,221,621 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 4221621 can be evenly divided by 1 3 9 469,069 1,407,207 and 4,221,621, with no remainder.
Since 4,221,621 cannot be divided by just 1 and 4,221,621, it is not a prime number.