A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2796000 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 75 80 96 100 120 125 150 160 200 233 240 250 300 375 400 466 480 500 600 699 750 800 932 1,000 1,165 1,200 1,398 1,500 1,864 2,000 2,330 2,400 2,796 3,000 3,495 3,728 4,000 4,660 5,592 5,825 6,000 6,990 7,456 9,320 11,184 11,650 12,000 13,980 17,475 18,640 22,368 23,300 27,960 29,125 34,950 37,280 46,600 55,920 58,250 69,900 87,375 93,200 111,840 116,500 139,800 174,750 186,400 233,000 279,600 349,500 466,000 559,200 699,000 932,000 1,398,000 and 2,796,000, with no remainder.
Since 2,796,000 cannot be divided by just 1 and 2,796,000, it is not a prime number.