A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2894136 can be evenly divided by 1 2 3 4 6 7 8 12 14 21 23 24 28 42 46 49 56 69 84 92 98 107 138 147 161 168 184 196 214 276 294 321 322 392 428 483 552 588 642 644 749 856 966 1,127 1,176 1,284 1,288 1,498 1,932 2,247 2,254 2,461 2,568 2,996 3,381 3,864 4,494 4,508 4,922 5,243 5,992 6,762 7,383 8,988 9,016 9,844 10,486 13,524 14,766 15,729 17,227 17,976 19,688 20,972 27,048 29,532 31,458 34,454 41,944 51,681 59,064 62,916 68,908 103,362 120,589 125,832 137,816 206,724 241,178 361,767 413,448 482,356 723,534 964,712 1,447,068 and 2,894,136, with no remainder.
Since 2,894,136 cannot be divided by just 1 and 2,894,136, it is not a prime number.