A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4812000 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 32 40 48 50 60 75 80 96 100 120 125 150 160 200 240 250 300 375 400 401 480 500 600 750 800 802 1,000 1,200 1,203 1,500 1,604 2,000 2,005 2,400 2,406 3,000 3,208 4,000 4,010 4,812 6,000 6,015 6,416 8,020 9,624 10,025 12,000 12,030 12,832 16,040 19,248 20,050 24,060 30,075 32,080 38,496 40,100 48,120 50,125 60,150 64,160 80,200 96,240 100,250 120,300 150,375 160,400 192,480 200,500 240,600 300,750 320,800 401,000 481,200 601,500 802,000 962,400 1,203,000 1,604,000 2,406,000 and 4,812,000, with no remainder.
Since 4,812,000 cannot be divided by just 1 and 4,812,000, it is not a prime number.