A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6922800 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 27 30 36 40 45 48 50 54 60 72 75 80 90 100 108 120 135 144 150 180 200 216 225 240 270 300 360 400 432 450 540 600 641 675 720 900 1,080 1,200 1,282 1,350 1,800 1,923 2,160 2,564 2,700 3,205 3,600 3,846 5,128 5,400 5,769 6,410 7,692 9,615 10,256 10,800 11,538 12,820 15,384 16,025 17,307 19,230 23,076 25,640 28,845 30,768 32,050 34,614 38,460 46,152 48,075 51,280 57,690 64,100 69,228 76,920 86,535 92,304 96,150 115,380 128,200 138,456 144,225 153,840 173,070 192,300 230,760 256,400 276,912 288,450 346,140 384,600 432,675 461,520 576,900 692,280 769,200 865,350 1,153,800 1,384,560 1,730,700 2,307,600 3,461,400 and 6,922,800, with no remainder.
Since 6,922,800 cannot be divided by just 1 and 6,922,800, it is not a prime number.