Q: Is 721,990 a Prime Number?
A: No, 721,990 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 721990 can be evenly divided by 1 2 5 10 17 31 34 62 85 137 155 170 274 310 527 685 1,054 1,370 2,329 2,635 4,247 4,658 5,270 8,494 11,645 21,235 23,290 42,470 72,199 144,398 360,995 and 721,990, with no remainder.
Since 721,990 cannot be divided by just 1 and 721,990, it is not a prime number.