A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4157400 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 20 24 25 26 30 39 40 41 50 52 60 65 75 78 82 100 104 120 123 130 150 156 164 169 195 200 205 246 260 300 312 325 328 338 390 410 492 507 520 533 600 615 650 676 780 820 845 975 984 1,014 1,025 1,066 1,230 1,300 1,352 1,560 1,599 1,640 1,690 1,950 2,028 2,050 2,132 2,460 2,535 2,600 2,665 3,075 3,198 3,380 3,900 4,056 4,100 4,225 4,264 4,920 5,070 5,330 6,150 6,396 6,760 6,929 7,800 7,995 8,200 8,450 10,140 10,660 12,300 12,675 12,792 13,325 13,858 15,990 16,900 20,280 20,787 21,320 24,600 25,350 26,650 27,716 31,980 33,800 34,645 39,975 41,574 50,700 53,300 55,432 63,960 69,290 79,950 83,148 101,400 103,935 106,600 138,580 159,900 166,296 173,225 207,870 277,160 319,800 346,450 415,740 519,675 692,900 831,480 1,039,350 1,385,800 2,078,700 and 4,157,400, with no remainder.
Since 4,157,400 cannot be divided by just 1 and 4,157,400, it is not a prime number.