A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5003328 can be evenly divided by 1 2 3 4 6 8 11 12 16 22 23 24 32 33 44 46 48 64 66 69 88 92 96 103 132 138 176 184 192 206 253 264 276 309 352 368 412 506 528 552 618 704 736 759 824 1,012 1,056 1,104 1,133 1,236 1,472 1,518 1,648 2,024 2,112 2,208 2,266 2,369 2,472 3,036 3,296 3,399 4,048 4,416 4,532 4,738 4,944 6,072 6,592 6,798 7,107 8,096 9,064 9,476 9,888 12,144 13,596 14,214 16,192 18,128 18,952 19,776 24,288 26,059 27,192 28,428 36,256 37,904 48,576 52,118 54,384 56,856 72,512 75,808 78,177 104,236 108,768 113,712 151,616 156,354 208,472 217,536 227,424 312,708 416,944 454,848 625,416 833,888 1,250,832 1,667,776 2,501,664 and 5,003,328, with no remainder.
Since 5,003,328 cannot be divided by just 1 and 5,003,328, it is not a prime number.