A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3672630 can be evenly divided by 1 2 3 5 6 9 10 13 15 18 26 30 39 43 45 65 73 78 86 90 117 129 130 146 195 215 219 234 258 365 387 390 430 438 559 585 645 657 730 774 949 1,095 1,118 1,170 1,290 1,314 1,677 1,898 1,935 2,190 2,795 2,847 3,139 3,285 3,354 3,870 4,745 5,031 5,590 5,694 6,278 6,570 8,385 8,541 9,417 9,490 10,062 14,235 15,695 16,770 17,082 18,834 25,155 28,251 28,470 31,390 40,807 42,705 47,085 50,310 56,502 81,614 85,410 94,170 122,421 141,255 204,035 244,842 282,510 367,263 408,070 612,105 734,526 1,224,210 1,836,315 and 3,672,630, with no remainder.
Since 3,672,630 cannot be divided by just 1 and 3,672,630, it is not a prime number.