A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4818150 can be evenly divided by 1 2 3 5 6 9 10 15 18 25 27 30 43 45 50 54 75 83 86 90 129 135 150 166 215 225 249 258 270 387 415 430 450 498 645 675 747 774 830 1,075 1,161 1,245 1,290 1,350 1,494 1,935 2,075 2,150 2,241 2,322 2,490 3,225 3,569 3,735 3,870 4,150 4,482 5,805 6,225 6,450 7,138 7,470 9,675 10,707 11,205 11,610 12,450 17,845 18,675 19,350 21,414 22,410 29,025 32,121 35,690 37,350 53,535 56,025 58,050 64,242 89,225 96,363 107,070 112,050 160,605 178,450 192,726 267,675 321,210 481,815 535,350 803,025 963,630 1,606,050 2,409,075 and 4,818,150, with no remainder.
Since 4,818,150 cannot be divided by just 1 and 4,818,150, it is not a prime number.