A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4877730 can be evenly divided by 1 2 3 5 6 9 10 11 13 15 18 22 26 30 33 39 45 55 65 66 78 90 99 110 117 130 143 165 195 198 234 286 330 379 390 429 495 585 715 758 858 990 1,137 1,170 1,287 1,430 1,895 2,145 2,274 2,574 3,411 3,790 4,169 4,290 4,927 5,685 6,435 6,822 8,338 9,854 11,370 12,507 12,870 14,781 17,055 20,845 24,635 25,014 29,562 34,110 37,521 41,690 44,343 49,270 54,197 62,535 73,905 75,042 88,686 108,394 125,070 147,810 162,591 187,605 221,715 270,985 325,182 375,210 443,430 487,773 541,970 812,955 975,546 1,625,910 2,438,865 and 4,877,730, with no remainder.
Since 4,877,730 cannot be divided by just 1 and 4,877,730, it is not a prime number.