A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6837180 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 20 21 28 30 35 42 60 70 73 84 105 140 146 210 219 223 292 365 420 438 446 511 669 730 876 892 1,022 1,095 1,115 1,338 1,460 1,533 1,561 2,044 2,190 2,230 2,555 2,676 3,066 3,122 3,345 4,380 4,460 4,683 5,110 6,132 6,244 6,690 7,665 7,805 9,366 10,220 13,380 15,330 15,610 16,279 18,732 23,415 30,660 31,220 32,558 46,830 48,837 65,116 81,395 93,660 97,674 113,953 162,790 195,348 227,906 244,185 325,580 341,859 455,812 488,370 569,765 683,718 976,740 1,139,530 1,367,436 1,709,295 2,279,060 3,418,590 and 6,837,180, with no remainder.
Since 6,837,180 cannot be divided by just 1 and 6,837,180, it is not a prime number.