A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2986800 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 19 20 24 25 30 38 40 48 50 57 60 75 76 80 95 100 114 120 131 150 152 190 200 228 240 262 285 300 304 380 393 400 456 475 524 570 600 655 760 786 912 950 1,048 1,140 1,200 1,310 1,425 1,520 1,572 1,900 1,965 2,096 2,280 2,489 2,620 2,850 3,144 3,275 3,800 3,930 4,560 4,978 5,240 5,700 6,288 6,550 7,467 7,600 7,860 9,825 9,956 10,480 11,400 12,445 13,100 14,934 15,720 19,650 19,912 22,800 24,890 26,200 29,868 31,440 37,335 39,300 39,824 49,780 52,400 59,736 62,225 74,670 78,600 99,560 119,472 124,450 149,340 157,200 186,675 199,120 248,900 298,680 373,350 497,800 597,360 746,700 995,600 1,493,400 and 2,986,800, with no remainder.
Since 2,986,800 cannot be divided by just 1 and 2,986,800, it is not a prime number.