A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4158630 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 23 30 35 41 42 45 46 49 63 69 70 82 90 98 105 115 123 126 138 147 161 205 207 210 230 245 246 287 294 315 322 345 369 410 414 441 483 490 574 615 630 690 735 738 805 861 882 943 966 1,035 1,127 1,230 1,435 1,449 1,470 1,610 1,722 1,845 1,886 2,009 2,070 2,205 2,254 2,415 2,583 2,829 2,870 2,898 3,381 3,690 4,018 4,305 4,410 4,715 4,830 5,166 5,635 5,658 6,027 6,601 6,762 7,245 8,487 8,610 9,430 10,045 10,143 11,270 12,054 12,915 13,202 14,145 14,490 16,905 16,974 18,081 19,803 20,090 20,286 25,830 28,290 30,135 33,005 33,810 36,162 39,606 42,435 46,207 50,715 59,409 60,270 66,010 84,870 90,405 92,414 99,015 101,430 118,818 138,621 180,810 198,030 231,035 277,242 297,045 415,863 462,070 594,090 693,105 831,726 1,386,210 2,079,315 and 4,158,630, with no remainder.
Since 4,158,630 cannot be divided by just 1 and 4,158,630, it is not a prime number.