A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2947200 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 32 40 48 50 60 64 75 80 96 100 120 128 150 160 192 200 240 300 307 320 384 400 480 600 614 640 800 921 960 1,200 1,228 1,535 1,600 1,842 1,920 2,400 2,456 3,070 3,200 3,684 4,605 4,800 4,912 6,140 7,368 7,675 9,210 9,600 9,824 12,280 14,736 15,350 18,420 19,648 23,025 24,560 29,472 30,700 36,840 39,296 46,050 49,120 58,944 61,400 73,680 92,100 98,240 117,888 122,800 147,360 184,200 196,480 245,600 294,720 368,400 491,200 589,440 736,800 982,400 1,473,600 and 2,947,200, with no remainder.
Since 2,947,200 cannot be divided by just 1 and 2,947,200, it is not a prime number.