A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4777200 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 30 36 40 45 48 50 60 72 75 80 90 100 120 144 150 180 200 225 240 300 360 400 450 600 720 900 1,200 1,327 1,800 2,654 3,600 3,981 5,308 6,635 7,962 10,616 11,943 13,270 15,924 19,905 21,232 23,886 26,540 31,848 33,175 39,810 47,772 53,080 59,715 63,696 66,350 79,620 95,544 99,525 106,160 119,430 132,700 159,240 191,088 199,050 238,860 265,400 298,575 318,480 398,100 477,720 530,800 597,150 796,200 955,440 1,194,300 1,592,400 2,388,600 and 4,777,200, with no remainder.
Since 4,777,200 cannot be divided by just 1 and 4,777,200, it is not a prime number.