Q: Is 445,221 a Prime Number?
A: No, 445,221 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 445221 can be evenly divided by 1 3 7 9 21 37 63 111 191 259 333 573 777 1,337 1,719 2,331 4,011 7,067 12,033 21,201 49,469 63,603 148,407 and 445,221, with no remainder.
Since 445,221 cannot be divided by just 1 and 445,221, it is not a prime number.