A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4310550 can be evenly divided by 1 2 3 5 6 9 10 15 18 25 27 30 31 45 50 54 62 75 90 93 103 135 150 155 186 206 225 270 279 309 310 450 465 515 558 618 675 775 837 927 930 1,030 1,350 1,395 1,545 1,550 1,674 1,854 2,325 2,575 2,781 2,790 3,090 3,193 4,185 4,635 4,650 5,150 5,562 6,386 6,975 7,725 8,370 9,270 9,579 13,905 13,950 15,450 15,965 19,158 20,925 23,175 27,810 28,737 31,930 41,850 46,350 47,895 57,474 69,525 79,825 86,211 95,790 139,050 143,685 159,650 172,422 239,475 287,370 431,055 478,950 718,425 862,110 1,436,850 2,155,275 and 4,310,550, with no remainder.
Since 4,310,550 cannot be divided by just 1 and 4,310,550, it is not a prime number.