A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2830800 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 25 28 30 35 40 42 48 50 56 60 70 75 80 84 100 105 112 120 140 150 168 175 200 210 240 280 300 336 337 350 400 420 525 560 600 674 700 840 1,011 1,050 1,200 1,348 1,400 1,680 1,685 2,022 2,100 2,359 2,696 2,800 3,370 4,044 4,200 4,718 5,055 5,392 6,740 7,077 8,088 8,400 8,425 9,436 10,110 11,795 13,480 14,154 16,176 16,850 18,872 20,220 23,590 25,275 26,960 28,308 33,700 35,385 37,744 40,440 47,180 50,550 56,616 58,975 67,400 70,770 80,880 94,360 101,100 113,232 117,950 134,800 141,540 176,925 188,720 202,200 235,900 283,080 353,850 404,400 471,800 566,160 707,700 943,600 1,415,400 and 2,830,800, with no remainder.
Since 2,830,800 cannot be divided by just 1 and 2,830,800, it is not a prime number.