A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2796300 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 25 26 30 36 39 45 50 52 60 65 75 78 90 100 117 130 150 156 180 195 225 234 239 260 300 325 390 450 468 478 585 650 717 780 900 956 975 1,170 1,195 1,300 1,434 1,950 2,151 2,340 2,390 2,868 2,925 3,107 3,585 3,900 4,302 4,780 5,850 5,975 6,214 7,170 8,604 9,321 10,755 11,700 11,950 12,428 14,340 15,535 17,925 18,642 21,510 23,900 27,963 31,070 35,850 37,284 43,020 46,605 53,775 55,926 62,140 71,700 77,675 93,210 107,550 111,852 139,815 155,350 186,420 215,100 233,025 279,630 310,700 466,050 559,260 699,075 932,100 1,398,150 and 2,796,300, with no remainder.
Since 2,796,300 cannot be divided by just 1 and 2,796,300, it is not a prime number.