A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6624800 can be evenly divided by 1 2 4 5 7 8 10 13 14 16 20 25 26 28 32 35 40 49 50 52 56 65 70 80 91 98 100 104 112 130 140 160 169 175 182 196 200 208 224 245 260 280 325 338 350 364 392 400 416 455 490 520 560 637 650 676 700 728 784 800 845 910 980 1,040 1,120 1,183 1,225 1,274 1,300 1,352 1,400 1,456 1,568 1,690 1,820 1,960 2,080 2,275 2,366 2,450 2,548 2,600 2,704 2,800 2,912 3,185 3,380 3,640 3,920 4,225 4,550 4,732 4,900 5,096 5,200 5,408 5,600 5,915 6,370 6,760 7,280 7,840 8,281 8,450 9,100 9,464 9,800 10,192 10,400 11,830 12,740 13,520 14,560 15,925 16,562 16,900 18,200 18,928 19,600 20,384 23,660 25,480 27,040 29,575 31,850 33,124 33,800 36,400 37,856 39,200 41,405 47,320 50,960 59,150 63,700 66,248 67,600 72,800 82,810 94,640 101,920 118,300 127,400 132,496 135,200 165,620 189,280 207,025 236,600 254,800 264,992 331,240 414,050 473,200 509,600 662,480 828,100 946,400 1,324,960 1,656,200 3,312,400 and 6,624,800, with no remainder.
Since 6,624,800 cannot be divided by just 1 and 6,624,800, it is not a prime number.