A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4643496 can be evenly divided by 1 2 3 4 6 8 9 11 12 13 18 22 24 26 33 36 39 41 44 52 66 72 78 82 88 99 104 117 121 123 132 143 156 164 198 234 242 246 264 286 312 328 363 369 396 429 451 468 484 492 533 572 726 738 792 858 902 936 968 984 1,066 1,089 1,144 1,287 1,353 1,452 1,476 1,573 1,599 1,716 1,804 2,132 2,178 2,574 2,706 2,904 2,952 3,146 3,198 3,432 3,608 4,059 4,264 4,356 4,719 4,797 4,961 5,148 5,412 5,863 6,292 6,396 8,118 8,712 9,438 9,594 9,922 10,296 10,824 11,726 12,584 12,792 14,157 14,883 16,236 17,589 18,876 19,188 19,844 23,452 28,314 29,766 32,472 35,178 37,752 38,376 39,688 44,649 46,904 52,767 56,628 59,532 64,493 70,356 89,298 105,534 113,256 119,064 128,986 140,712 178,596 193,479 211,068 257,972 357,192 386,958 422,136 515,944 580,437 773,916 1,160,874 1,547,832 2,321,748 and 4,643,496, with no remainder.
Since 4,643,496 cannot be divided by just 1 and 4,643,496, it is not a prime number.