A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5715600 can be evenly divided by 1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 25 30 33 40 44 48 50 55 60 66 75 80 88 100 110 120 132 150 165 176 200 220 240 264 275 300 330 400 433 440 528 550 600 660 825 866 880 1,100 1,200 1,299 1,320 1,650 1,732 2,165 2,200 2,598 2,640 3,300 3,464 4,330 4,400 4,763 5,196 6,495 6,600 6,928 8,660 9,526 10,392 10,825 12,990 13,200 14,289 17,320 19,052 20,784 21,650 23,815 25,980 28,578 32,475 34,640 38,104 43,300 47,630 51,960 57,156 64,950 71,445 76,208 86,600 95,260 103,920 114,312 119,075 129,900 142,890 173,200 190,520 228,624 238,150 259,800 285,780 357,225 381,040 476,300 519,600 571,560 714,450 952,600 1,143,120 1,428,900 1,905,200 2,857,800 and 5,715,600, with no remainder.
Since 5,715,600 cannot be divided by just 1 and 5,715,600, it is not a prime number.