A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2423850 can be evenly divided by 1 2 3 5 6 10 11 13 15 22 25 26 30 33 39 50 55 65 66 75 78 110 113 130 143 150 165 195 226 275 286 325 330 339 390 429 550 565 650 678 715 825 858 975 1,130 1,243 1,430 1,469 1,650 1,695 1,950 2,145 2,486 2,825 2,938 3,390 3,575 3,729 4,290 4,407 5,650 6,215 7,150 7,345 7,458 8,475 8,814 10,725 12,430 14,690 16,159 16,950 18,645 21,450 22,035 31,075 32,318 36,725 37,290 44,070 48,477 62,150 73,450 80,795 93,225 96,954 110,175 161,590 186,450 220,350 242,385 403,975 484,770 807,950 1,211,925 and 2,423,850, with no remainder.
Since 2,423,850 cannot be divided by just 1 and 2,423,850, it is not a prime number.