A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8450400 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 25 28 30 32 35 40 42 48 50 56 60 70 75 80 84 96 100 105 112 120 140 150 160 168 175 200 210 224 240 280 300 336 350 400 420 480 503 525 560 600 672 700 800 840 1,006 1,050 1,120 1,200 1,400 1,509 1,680 2,012 2,100 2,400 2,515 2,800 3,018 3,360 3,521 4,024 4,200 5,030 5,600 6,036 7,042 7,545 8,048 8,400 10,060 10,563 12,072 12,575 14,084 15,090 16,096 16,800 17,605 20,120 21,126 24,144 25,150 28,168 30,180 35,210 37,725 40,240 42,252 48,288 50,300 52,815 56,336 60,360 70,420 75,450 80,480 84,504 88,025 100,600 105,630 112,672 120,720 140,840 150,900 169,008 176,050 201,200 211,260 241,440 264,075 281,680 301,800 338,016 352,100 402,400 422,520 528,150 563,360 603,600 704,200 845,040 1,056,300 1,207,200 1,408,400 1,690,080 2,112,600 2,816,800 4,225,200 and 8,450,400, with no remainder.
Since 8,450,400 cannot be divided by just 1 and 8,450,400, it is not a prime number.