A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4667220 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 43 45 54 60 67 81 86 90 108 129 134 135 162 172 180 201 215 258 268 270 324 335 387 402 405 430 516 540 603 645 670 774 804 810 860 1,005 1,161 1,206 1,290 1,340 1,548 1,620 1,809 1,935 2,010 2,322 2,412 2,580 2,881 3,015 3,483 3,618 3,870 4,020 4,644 5,427 5,762 5,805 6,030 6,966 7,236 7,740 8,643 9,045 10,854 11,524 11,610 12,060 13,932 14,405 17,286 17,415 18,090 21,708 23,220 25,929 27,135 28,810 34,572 34,830 36,180 43,215 51,858 54,270 57,620 69,660 77,787 86,430 103,716 108,540 129,645 155,574 172,860 233,361 259,290 311,148 388,935 466,722 518,580 777,870 933,444 1,166,805 1,555,740 2,333,610 and 4,667,220, with no remainder.
Since 4,667,220 cannot be divided by just 1 and 4,667,220, it is not a prime number.