A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5757360 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 23 24 28 30 35 40 42 46 48 56 60 69 70 80 84 92 105 112 115 120 138 140 149 161 168 184 210 230 240 276 280 298 322 336 345 368 420 447 460 483 552 560 596 644 690 745 805 840 894 920 966 1,043 1,104 1,192 1,288 1,380 1,490 1,610 1,680 1,788 1,840 1,932 2,086 2,235 2,384 2,415 2,576 2,760 2,980 3,129 3,220 3,427 3,576 3,864 4,172 4,470 4,830 5,215 5,520 5,960 6,258 6,440 6,854 7,152 7,728 8,344 8,940 9,660 10,281 10,430 11,920 12,516 12,880 13,708 15,645 16,688 17,135 17,880 19,320 20,562 20,860 23,989 25,032 27,416 31,290 34,270 35,760 38,640 41,124 41,720 47,978 50,064 51,405 54,832 62,580 68,540 71,967 82,248 83,440 95,956 102,810 119,945 125,160 137,080 143,934 164,496 191,912 205,620 239,890 250,320 274,160 287,868 359,835 383,824 411,240 479,780 575,736 719,670 822,480 959,560 1,151,472 1,439,340 1,919,120 2,878,680 and 5,757,360, with no remainder.
Since 5,757,360 cannot be divided by just 1 and 5,757,360, it is not a prime number.