A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4881744 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 28 29 36 42 48 56 58 63 72 84 87 112 116 126 144 167 168 174 203 232 252 261 334 336 348 406 464 501 504 522 609 668 696 812 1,002 1,008 1,044 1,169 1,218 1,336 1,392 1,503 1,624 1,827 2,004 2,088 2,338 2,436 2,672 3,006 3,248 3,507 3,654 4,008 4,176 4,676 4,843 4,872 6,012 7,014 7,308 8,016 9,352 9,686 9,744 10,521 12,024 14,028 14,529 14,616 18,704 19,372 21,042 24,048 28,056 29,058 29,232 33,901 38,744 42,084 43,587 56,112 58,116 67,802 77,488 84,168 87,174 101,703 116,232 135,604 168,336 174,348 203,406 232,464 271,208 305,109 348,696 406,812 542,416 610,218 697,392 813,624 1,220,436 1,627,248 2,440,872 and 4,881,744, with no remainder.
Since 4,881,744 cannot be divided by just 1 and 4,881,744, it is not a prime number.