A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2754024 can be evenly divided by 1 2 3 4 6 7 8 12 13 14 21 24 26 28 39 42 52 56 78 84 91 97 104 156 168 169 182 194 273 291 312 338 364 388 507 546 582 676 679 728 776 1,014 1,092 1,164 1,183 1,261 1,352 1,358 2,028 2,037 2,184 2,328 2,366 2,522 2,716 3,549 3,783 4,056 4,074 4,732 5,044 5,432 7,098 7,566 8,148 8,827 9,464 10,088 14,196 15,132 16,296 16,393 17,654 26,481 28,392 30,264 32,786 35,308 49,179 52,962 65,572 70,616 98,358 105,924 114,751 131,144 196,716 211,848 229,502 344,253 393,432 459,004 688,506 918,008 1,377,012 and 2,754,024, with no remainder.
Since 2,754,024 cannot be divided by just 1 and 2,754,024, it is not a prime number.