A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4774770 can be evenly divided by 1 2 3 5 6 7 9 10 11 13 14 15 18 21 22 26 30 33 35 39 42 45 53 55 63 65 66 70 77 78 90 91 99 105 106 110 117 126 130 143 154 159 165 182 195 198 210 231 234 265 273 286 315 318 330 371 385 390 429 455 462 477 495 530 546 583 585 630 689 693 715 742 770 795 819 858 910 954 990 1,001 1,113 1,155 1,166 1,170 1,287 1,365 1,378 1,386 1,430 1,590 1,638 1,749 1,855 2,002 2,067 2,145 2,226 2,310 2,385 2,574 2,730 2,915 3,003 3,339 3,445 3,465 3,498 3,710 4,081 4,095 4,134 4,290 4,770 4,823 5,005 5,247 5,565 5,830 6,006 6,201 6,435 6,678 6,890 6,930 7,579 8,162 8,190 8,745 9,009 9,646 10,010 10,335 10,494 11,130 12,243 12,402 12,870 14,469 15,015 15,158 16,695 17,490 18,018 20,405 20,670 22,737 24,115 24,486 26,235 28,938 30,030 31,005 33,390 36,729 37,895 40,810 43,407 45,045 45,474 48,230 52,470 53,053 61,215 62,010 68,211 72,345 73,458 75,790 86,814 90,090 106,106 113,685 122,430 136,422 144,690 159,159 183,645 217,035 227,370 265,265 318,318 341,055 367,290 434,070 477,477 530,530 682,110 795,795 954,954 1,591,590 2,387,385 and 4,774,770, with no remainder.
Since 4,774,770 cannot be divided by just 1 and 4,774,770, it is not a prime number.