Q: Is 721,500 a Prime Number?
A: No, 721,500 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 721500 can be evenly divided by 1 2 3 4 5 6 10 12 13 15 20 25 26 30 37 39 50 52 60 65 74 75 78 100 111 125 130 148 150 156 185 195 222 250 260 300 325 370 375 390 444 481 500 555 650 740 750 780 925 962 975 1,110 1,300 1,443 1,500 1,625 1,850 1,924 1,950 2,220 2,405 2,775 2,886 3,250 3,700 3,900 4,625 4,810 4,875 5,550 5,772 6,500 7,215 9,250 9,620 9,750 11,100 12,025 13,875 14,430 18,500 19,500 24,050 27,750 28,860 36,075 48,100 55,500 60,125 72,150 120,250 144,300 180,375 240,500 360,750 and 721,500, with no remainder.
Since 721,500 cannot be divided by just 1 and 721,500, it is not a prime number.