A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4344384 can be evenly divided by 1 2 3 4 6 8 11 12 16 17 22 24 32 33 34 44 48 51 64 66 68 88 96 102 121 132 136 176 187 192 204 242 264 272 352 363 374 408 484 528 544 561 704 726 748 816 968 1,056 1,088 1,122 1,331 1,452 1,496 1,632 1,936 2,057 2,112 2,244 2,662 2,904 2,992 3,264 3,872 3,993 4,114 4,488 5,324 5,808 5,984 6,171 7,744 7,986 8,228 8,976 10,648 11,616 11,968 12,342 15,972 16,456 17,952 21,296 22,627 23,232 24,684 31,944 32,912 35,904 42,592 45,254 49,368 63,888 65,824 67,881 85,184 90,508 98,736 127,776 131,648 135,762 181,016 197,472 255,552 271,524 362,032 394,944 543,048 724,064 1,086,096 1,448,128 2,172,192 and 4,344,384, with no remainder.
Since 4,344,384 cannot be divided by just 1 and 4,344,384, it is not a prime number.