Q: Is 221,661 a Prime Number?
A: No, 221,661 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 221661 can be evenly divided by 1 3 9 11 33 99 2,239 6,717 20,151 24,629 73,887 and 221,661, with no remainder.
Since 221,661 cannot be divided by just 1 and 221,661, it is not a prime number.