Q: Is 721,560 a Prime Number?
A: No, 721,560 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 721560 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 28 30 35 40 42 56 60 70 84 105 120 140 168 210 280 420 840 859 1,718 2,577 3,436 4,295 5,154 6,013 6,872 8,590 10,308 12,026 12,885 17,180 18,039 20,616 24,052 25,770 30,065 34,360 36,078 48,104 51,540 60,130 72,156 90,195 103,080 120,260 144,312 180,390 240,520 360,780 and 721,560, with no remainder.
Since 721,560 cannot be divided by just 1 and 721,560, it is not a prime number.