Q: Is 1,621,072 a Prime Number?
A: No, 1,621,072 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 1621072 can be evenly divided by 1 2 4 8 16 71 142 284 568 1,136 1,427 2,854 5,708 11,416 22,832 101,317 202,634 405,268 810,536 and 1,621,072, with no remainder.
Since 1,621,072 cannot be divided by just 1 and 1,621,072, it is not a prime number.