Q: Is 721,616 a Prime Number?
A: No, 721,616 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 721616 can be evenly divided by 1 2 4 7 8 14 16 17 28 34 56 68 112 119 136 238 272 379 476 758 952 1,516 1,904 2,653 3,032 5,306 6,064 6,443 10,612 12,886 21,224 25,772 42,448 45,101 51,544 90,202 103,088 180,404 360,808 and 721,616, with no remainder.
Since 721,616 cannot be divided by just 1 and 721,616, it is not a prime number.