A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2796696 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 21 24 28 31 36 42 56 62 63 72 84 93 124 126 168 179 186 217 248 252 279 358 372 434 504 537 558 651 716 744 868 1,074 1,116 1,253 1,302 1,432 1,611 1,736 1,953 2,148 2,232 2,506 2,604 3,222 3,759 3,906 4,296 5,012 5,208 5,549 6,444 7,518 7,812 10,024 11,098 11,277 12,888 15,036 15,624 16,647 22,196 22,554 30,072 33,294 38,843 44,392 45,108 49,941 66,588 77,686 90,216 99,882 116,529 133,176 155,372 199,764 233,058 310,744 349,587 399,528 466,116 699,174 932,232 1,398,348 and 2,796,696, with no remainder.
Since 2,796,696 cannot be divided by just 1 and 2,796,696, it is not a prime number.