A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 562800 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 67 70 75 80 84 100 105 112 120 134 140 150 168 175 200 201 210 240 268 280 300 335 336 350 400 402 420 469 525 536 560 600 670 700 804 840 938 1,005 1,050 1,072 1,200 1,340 1,400 1,407 1,608 1,675 1,680 1,876 2,010 2,100 2,345 2,680 2,800 2,814 3,216 3,350 3,752 4,020 4,200 4,690 5,025 5,360 5,628 6,700 7,035 7,504 8,040 8,400 9,380 10,050 11,256 11,725 13,400 14,070 16,080 18,760 20,100 22,512 23,450 26,800 28,140 35,175 37,520 40,200 46,900 56,280 70,350 80,400 93,800 112,560 140,700 187,600 281,400 and 562,800, with no remainder.
Since 562,800 cannot be divided by just 1 and 562,800, it is not a prime number.