A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5237100 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 23 25 30 33 36 44 45 46 50 55 60 66 69 75 90 92 99 100 110 115 132 138 150 165 180 198 207 220 225 230 253 275 276 300 330 345 396 414 450 460 495 506 529 550 575 660 690 759 825 828 900 990 1,012 1,035 1,058 1,100 1,150 1,265 1,380 1,518 1,587 1,650 1,725 1,980 2,070 2,116 2,277 2,300 2,475 2,530 2,645 3,036 3,174 3,300 3,450 3,795 4,140 4,554 4,761 4,950 5,060 5,175 5,290 5,819 6,325 6,348 6,900 7,590 7,935 9,108 9,522 9,900 10,350 10,580 11,385 11,638 12,650 13,225 15,180 15,870 17,457 18,975 19,044 20,700 22,770 23,276 23,805 25,300 26,450 29,095 31,740 34,914 37,950 39,675 45,540 47,610 52,371 52,900 56,925 58,190 69,828 75,900 79,350 87,285 95,220 104,742 113,850 116,380 119,025 145,475 158,700 174,570 209,484 227,700 238,050 261,855 290,950 349,140 436,425 476,100 523,710 581,900 872,850 1,047,420 1,309,275 1,745,700 2,618,550 and 5,237,100, with no remainder.
Since 5,237,100 cannot be divided by just 1 and 5,237,100, it is not a prime number.