Q: Is 721,608 a Prime Number?
A: No, 721,608 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 721608 can be evenly divided by 1 2 3 4 6 8 12 24 107 214 281 321 428 562 642 843 856 1,124 1,284 1,686 2,248 2,568 3,372 6,744 30,067 60,134 90,201 120,268 180,402 240,536 360,804 and 721,608, with no remainder.
Since 721,608 cannot be divided by just 1 and 721,608, it is not a prime number.