A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2743632 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 27 29 36 48 54 58 72 73 81 87 108 116 144 146 162 174 216 219 232 261 292 324 348 432 438 464 522 584 648 657 696 783 876 1,044 1,168 1,296 1,314 1,392 1,566 1,752 1,971 2,088 2,117 2,349 2,628 3,132 3,504 3,942 4,176 4,234 4,698 5,256 5,913 6,264 6,351 7,884 8,468 9,396 10,512 11,826 12,528 12,702 15,768 16,936 18,792 19,053 23,652 25,404 31,536 33,872 37,584 38,106 47,304 50,808 57,159 76,212 94,608 101,616 114,318 152,424 171,477 228,636 304,848 342,954 457,272 685,908 914,544 1,371,816 and 2,743,632, with no remainder.
Since 2,743,632 cannot be divided by just 1 and 2,743,632, it is not a prime number.