A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1482624 can be evenly divided by 1 2 3 4 6 8 9 11 12 13 16 18 22 24 26 27 32 33 36 39 44 48 52 54 64 66 72 78 81 88 96 99 104 108 117 128 132 143 144 156 162 176 192 198 208 216 234 264 286 288 297 312 324 351 352 384 396 416 429 432 468 528 572 576 594 624 648 702 704 792 832 858 864 891 936 1,053 1,056 1,144 1,152 1,188 1,248 1,287 1,296 1,404 1,408 1,584 1,664 1,716 1,728 1,782 1,872 2,106 2,112 2,288 2,376 2,496 2,574 2,592 2,808 3,168 3,432 3,456 3,564 3,744 3,861 4,212 4,224 4,576 4,752 4,992 5,148 5,184 5,616 6,336 6,864 7,128 7,488 7,722 8,424 9,152 9,504 10,296 10,368 11,232 11,583 12,672 13,728 14,256 14,976 15,444 16,848 18,304 19,008 20,592 22,464 23,166 27,456 28,512 30,888 33,696 38,016 41,184 44,928 46,332 54,912 57,024 61,776 67,392 82,368 92,664 114,048 123,552 134,784 164,736 185,328 247,104 370,656 494,208 741,312 and 1,482,624, with no remainder.
Since 1,482,624 cannot be divided by just 1 and 1,482,624, it is not a prime number.