A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 629160 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 28 30 35 40 42 49 56 60 70 84 98 105 107 120 140 147 168 196 210 214 245 280 294 321 392 420 428 490 535 588 642 735 749 840 856 980 1,070 1,176 1,284 1,470 1,498 1,605 1,960 2,140 2,247 2,568 2,940 2,996 3,210 3,745 4,280 4,494 5,243 5,880 5,992 6,420 7,490 8,988 10,486 11,235 12,840 14,980 15,729 17,976 20,972 22,470 26,215 29,960 31,458 41,944 44,940 52,430 62,916 78,645 89,880 104,860 125,832 157,290 209,720 314,580 and 629,160, with no remainder.
Since 629,160 cannot be divided by just 1 and 629,160, it is not a prime number.