A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3885552 can be evenly divided by 1 2 3 4 6 8 9 11 12 16 18 22 24 33 36 44 48 66 72 88 99 121 132 144 176 198 223 242 264 363 396 446 484 528 669 726 792 892 968 1,089 1,338 1,452 1,584 1,784 1,936 2,007 2,178 2,453 2,676 2,904 3,568 4,014 4,356 4,906 5,352 5,808 7,359 8,028 8,712 9,812 10,704 14,718 16,056 17,424 19,624 22,077 26,983 29,436 32,112 39,248 44,154 53,966 58,872 80,949 88,308 107,932 117,744 161,898 176,616 215,864 242,847 323,796 353,232 431,728 485,694 647,592 971,388 1,295,184 1,942,776 and 3,885,552, with no remainder.
Since 3,885,552 cannot be divided by just 1 and 3,885,552, it is not a prime number.