A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4378800 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 40 41 48 50 60 75 80 82 89 100 120 123 150 164 178 200 205 240 246 267 300 328 356 400 410 445 492 534 600 615 656 712 820 890 984 1,025 1,068 1,200 1,230 1,335 1,424 1,640 1,780 1,968 2,050 2,136 2,225 2,460 2,670 3,075 3,280 3,560 3,649 4,100 4,272 4,450 4,920 5,340 6,150 6,675 7,120 7,298 8,200 8,900 9,840 10,680 10,947 12,300 13,350 14,596 16,400 17,800 18,245 21,360 21,894 24,600 26,700 29,192 35,600 36,490 43,788 49,200 53,400 54,735 58,384 72,980 87,576 91,225 106,800 109,470 145,960 175,152 182,450 218,940 273,675 291,920 364,900 437,880 547,350 729,800 875,760 1,094,700 1,459,600 2,189,400 and 4,378,800, with no remainder.
Since 4,378,800 cannot be divided by just 1 and 4,378,800, it is not a prime number.