A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2884350 can be evenly divided by 1 2 3 5 6 7 10 14 15 21 25 30 35 41 42 50 67 70 75 82 105 123 134 150 175 201 205 210 246 287 335 350 402 410 469 525 574 615 670 861 938 1,005 1,025 1,050 1,230 1,407 1,435 1,675 1,722 2,010 2,050 2,345 2,747 2,814 2,870 3,075 3,350 4,305 4,690 5,025 5,494 6,150 7,035 7,175 8,241 8,610 10,050 11,725 13,735 14,070 14,350 16,482 19,229 21,525 23,450 27,470 35,175 38,458 41,205 43,050 57,687 68,675 70,350 82,410 96,145 115,374 137,350 192,290 206,025 288,435 412,050 480,725 576,870 961,450 1,442,175 and 2,884,350, with no remainder.
Since 2,884,350 cannot be divided by just 1 and 2,884,350, it is not a prime number.