A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4403364 can be evenly divided by 1 2 3 4 6 7 12 14 19 21 28 31 38 42 57 62 76 84 89 93 114 124 133 178 186 217 228 266 267 356 372 399 434 532 534 589 623 651 798 868 1,068 1,178 1,246 1,302 1,596 1,691 1,767 1,869 2,356 2,492 2,604 2,759 3,382 3,534 3,738 4,123 5,073 5,518 6,764 7,068 7,476 8,246 8,277 10,146 11,036 11,837 12,369 16,492 16,554 19,313 20,292 23,674 24,738 33,108 35,511 38,626 47,348 49,476 52,421 57,939 71,022 77,252 104,842 115,878 142,044 157,263 209,684 231,756 314,526 366,947 629,052 733,894 1,100,841 1,467,788 2,201,682 and 4,403,364, with no remainder.
Since 4,403,364 cannot be divided by just 1 and 4,403,364, it is not a prime number.