Q: Is 221,216 a Prime Number?
A: No, 221,216 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 221216 can be evenly divided by 1 2 4 8 16 31 32 62 124 223 248 446 496 892 992 1,784 3,568 6,913 7,136 13,826 27,652 55,304 110,608 and 221,216, with no remainder.
Since 221,216 cannot be divided by just 1 and 221,216, it is not a prime number.