A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 727650 can be evenly divided by 1 2 3 5 6 7 9 10 11 14 15 18 21 22 25 27 30 33 35 42 45 49 50 54 55 63 66 70 75 77 90 98 99 105 110 126 135 147 150 154 165 175 189 198 210 225 231 245 270 275 294 297 315 330 350 378 385 441 450 462 490 495 525 539 550 594 630 675 693 735 770 825 882 945 990 1,050 1,078 1,155 1,225 1,323 1,350 1,386 1,470 1,485 1,575 1,617 1,650 1,890 1,925 2,079 2,205 2,310 2,450 2,475 2,646 2,695 2,970 3,150 3,234 3,465 3,675 3,850 4,158 4,410 4,725 4,851 4,950 5,390 5,775 6,615 6,930 7,350 7,425 8,085 9,450 9,702 10,395 11,025 11,550 13,230 13,475 14,553 14,850 16,170 17,325 20,790 22,050 24,255 26,950 29,106 33,075 34,650 40,425 48,510 51,975 66,150 72,765 80,850 103,950 121,275 145,530 242,550 363,825 and 727,650, with no remainder.
Since 727,650 cannot be divided by just 1 and 727,650, it is not a prime number.