A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4773384 can be evenly divided by 1 2 3 4 6 7 8 9 11 12 14 18 21 22 24 27 28 33 36 41 42 44 49 54 56 63 66 72 77 82 84 88 98 99 108 123 126 132 147 154 164 168 189 196 198 216 231 246 252 264 287 294 297 308 328 369 378 392 396 441 451 462 492 504 539 574 588 594 616 693 738 756 792 861 882 902 924 984 1,078 1,107 1,148 1,176 1,188 1,323 1,353 1,386 1,476 1,512 1,617 1,722 1,764 1,804 1,848 2,009 2,079 2,156 2,214 2,296 2,376 2,583 2,646 2,706 2,772 2,952 3,157 3,234 3,444 3,528 3,608 4,018 4,059 4,158 4,312 4,428 4,851 5,166 5,292 5,412 5,544 6,027 6,314 6,468 6,888 7,749 8,036 8,118 8,316 8,856 9,471 9,702 10,332 10,584 10,824 12,054 12,177 12,628 12,936 14,553 15,498 16,072 16,236 16,632 18,081 18,942 19,404 20,664 22,099 24,108 24,354 25,256 28,413 29,106 30,996 32,472 36,162 37,884 38,808 44,198 48,216 48,708 54,243 56,826 58,212 61,992 66,297 72,324 75,768 85,239 88,396 97,416 108,486 113,652 116,424 132,594 144,648 170,478 176,792 198,891 216,972 227,304 265,188 340,956 397,782 433,944 530,376 596,673 681,912 795,564 1,193,346 1,591,128 2,386,692 and 4,773,384, with no remainder.
Since 4,773,384 cannot be divided by just 1 and 4,773,384, it is not a prime number.