A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2998464 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 21 23 24 28 32 42 46 48 56 64 69 84 92 96 97 112 138 161 168 184 192 194 224 276 291 322 336 368 388 448 483 552 582 644 672 679 736 776 966 1,104 1,164 1,288 1,344 1,358 1,472 1,552 1,932 2,037 2,208 2,231 2,328 2,576 2,716 3,104 3,864 4,074 4,416 4,462 4,656 5,152 5,432 6,208 6,693 7,728 8,148 8,924 9,312 10,304 10,864 13,386 15,456 15,617 16,296 17,848 18,624 21,728 26,772 30,912 31,234 32,592 35,696 43,456 46,851 53,544 62,468 65,184 71,392 93,702 107,088 124,936 130,368 142,784 187,404 214,176 249,872 374,808 428,352 499,744 749,616 999,488 1,499,232 and 2,998,464, with no remainder.
Since 2,998,464 cannot be divided by just 1 and 2,998,464, it is not a prime number.