A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 471744 can be evenly divided by 1 2 3 4 6 7 8 9 12 13 14 16 18 21 24 26 27 28 32 36 39 42 48 52 54 56 63 64 72 78 81 84 91 96 104 108 112 117 126 144 156 162 168 182 189 192 208 216 224 234 252 273 288 312 324 336 351 364 378 416 432 448 468 504 546 567 576 624 648 672 702 728 756 819 832 864 936 1,008 1,053 1,092 1,134 1,248 1,296 1,344 1,404 1,456 1,512 1,638 1,728 1,872 2,016 2,106 2,184 2,268 2,457 2,496 2,592 2,808 2,912 3,024 3,276 3,744 4,032 4,212 4,368 4,536 4,914 5,184 5,616 5,824 6,048 6,552 7,371 7,488 8,424 8,736 9,072 9,828 11,232 12,096 13,104 14,742 16,848 17,472 18,144 19,656 22,464 26,208 29,484 33,696 36,288 39,312 52,416 58,968 67,392 78,624 117,936 157,248 235,872 and 471,744, with no remainder.
Since 471,744 cannot be divided by just 1 and 471,744, it is not a prime number.