A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3624570 can be evenly divided by 1 2 3 5 6 9 10 15 17 18 23 30 34 45 46 51 69 85 90 102 103 115 138 153 170 206 207 230 255 306 309 345 391 414 510 515 618 690 765 782 927 1,030 1,035 1,173 1,530 1,545 1,751 1,854 1,955 2,070 2,346 2,369 3,090 3,502 3,519 3,910 4,635 4,738 5,253 5,865 7,038 7,107 8,755 9,270 10,506 11,730 11,845 14,214 15,759 17,510 17,595 21,321 23,690 26,265 31,518 35,190 35,535 40,273 42,642 52,530 71,070 78,795 80,546 106,605 120,819 157,590 201,365 213,210 241,638 362,457 402,730 604,095 724,914 1,208,190 1,812,285 and 3,624,570, with no remainder.
Since 3,624,570 cannot be divided by just 1 and 3,624,570, it is not a prime number.