A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6116670 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 19 21 30 35 38 42 45 49 57 63 70 73 90 95 98 105 114 126 133 146 147 171 190 210 219 245 266 285 294 315 342 365 399 438 441 490 511 570 630 657 665 730 735 798 855 882 931 1,022 1,095 1,197 1,314 1,330 1,387 1,470 1,533 1,710 1,862 1,995 2,190 2,205 2,394 2,555 2,774 2,793 3,066 3,285 3,577 3,990 4,161 4,410 4,599 4,655 5,110 5,586 5,985 6,570 6,935 7,154 7,665 8,322 8,379 9,198 9,310 9,709 10,731 11,970 12,483 13,870 13,965 15,330 16,758 17,885 19,418 20,805 21,462 22,995 24,966 27,930 29,127 32,193 35,770 41,610 41,895 45,990 48,545 53,655 58,254 62,415 64,386 67,963 83,790 87,381 97,090 107,310 124,830 135,926 145,635 160,965 174,762 203,889 291,270 321,930 339,815 407,778 436,905 611,667 679,630 873,810 1,019,445 1,223,334 2,038,890 3,058,335 and 6,116,670, with no remainder.
Since 6,116,670 cannot be divided by just 1 and 6,116,670, it is not a prime number.