A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4888400 can be evenly divided by 1 2 4 5 8 10 11 16 20 22 25 40 44 50 55 80 88 100 101 110 121 176 200 202 220 242 275 400 404 440 484 505 550 605 808 880 968 1,010 1,100 1,111 1,210 1,616 1,936 2,020 2,200 2,222 2,420 2,525 3,025 4,040 4,400 4,444 4,840 5,050 5,555 6,050 8,080 8,888 9,680 10,100 11,110 12,100 12,221 17,776 20,200 22,220 24,200 24,442 27,775 40,400 44,440 48,400 48,884 55,550 61,105 88,880 97,768 111,100 122,210 195,536 222,200 244,420 305,525 444,400 488,840 611,050 977,680 1,222,100 2,444,200 and 4,888,400, with no remainder.
Since 4,888,400 cannot be divided by just 1 and 4,888,400, it is not a prime number.