Q: Is 721,600 a Prime Number?
A: No, 721,600 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 721600 can be evenly divided by 1 2 4 5 8 10 11 16 20 22 25 32 40 41 44 50 55 64 80 82 88 100 110 160 164 176 200 205 220 275 320 328 352 400 410 440 451 550 656 704 800 820 880 902 1,025 1,100 1,312 1,600 1,640 1,760 1,804 2,050 2,200 2,255 2,624 3,280 3,520 3,608 4,100 4,400 4,510 6,560 7,216 8,200 8,800 9,020 11,275 13,120 14,432 16,400 17,600 18,040 22,550 28,864 32,800 36,080 45,100 65,600 72,160 90,200 144,320 180,400 360,800 and 721,600, with no remainder.
Since 721,600 cannot be divided by just 1 and 721,600, it is not a prime number.