A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2914912 can be evenly divided by 1 2 4 7 8 11 13 14 16 22 26 28 32 44 49 52 56 77 88 91 98 104 112 143 154 169 176 182 196 208 224 286 308 338 352 364 392 416 539 572 616 637 676 728 784 1,001 1,078 1,144 1,183 1,232 1,274 1,352 1,456 1,568 1,859 2,002 2,156 2,288 2,366 2,464 2,548 2,704 2,912 3,718 4,004 4,312 4,576 4,732 5,096 5,408 7,007 7,436 8,008 8,281 8,624 9,464 10,192 13,013 14,014 14,872 16,016 16,562 17,248 18,928 20,384 26,026 28,028 29,744 32,032 33,124 37,856 52,052 56,056 59,488 66,248 91,091 104,104 112,112 132,496 182,182 208,208 224,224 264,992 364,364 416,416 728,728 1,457,456 and 2,914,912, with no remainder.
Since 2,914,912 cannot be divided by just 1 and 2,914,912, it is not a prime number.