A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5119400 can be evenly divided by 1 2 4 5 8 10 11 13 20 22 25 26 40 44 50 52 55 65 88 100 104 110 130 143 179 200 220 260 275 286 325 358 440 520 550 572 650 715 716 895 1,100 1,144 1,300 1,430 1,432 1,790 1,969 2,200 2,327 2,600 2,860 3,575 3,580 3,938 4,475 4,654 5,720 7,150 7,160 7,876 8,950 9,308 9,845 11,635 14,300 15,752 17,900 18,616 19,690 23,270 25,597 28,600 35,800 39,380 46,540 49,225 51,194 58,175 78,760 93,080 98,450 102,388 116,350 127,985 196,900 204,776 232,700 255,970 393,800 465,400 511,940 639,925 1,023,880 1,279,850 2,559,700 and 5,119,400, with no remainder.
Since 5,119,400 cannot be divided by just 1 and 5,119,400, it is not a prime number.