Q: Is 1,621,216 a Prime Number?
A: No, 1,621,216 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 1621216 can be evenly divided by 1 2 4 8 16 29 32 58 116 232 464 928 1,747 3,494 6,988 13,976 27,952 50,663 55,904 101,326 202,652 405,304 810,608 and 1,621,216, with no remainder.
Since 1,621,216 cannot be divided by just 1 and 1,621,216, it is not a prime number.