A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6146595 can be evenly divided by 1 3 5 7 9 13 15 19 21 35 39 45 57 63 65 79 91 95 105 117 133 171 195 237 247 273 285 315 395 399 455 553 585 665 711 741 819 855 1,027 1,185 1,197 1,235 1,365 1,501 1,659 1,729 1,995 2,223 2,765 3,081 3,555 3,705 4,095 4,503 4,977 5,135 5,187 5,985 7,189 7,505 8,295 8,645 9,243 10,507 11,115 13,509 15,405 15,561 19,513 21,567 22,515 24,885 25,935 31,521 35,945 46,215 52,535 58,539 64,701 67,545 77,805 94,563 97,565 107,835 136,591 157,605 175,617 292,695 323,505 409,773 472,815 682,955 878,085 1,229,319 2,048,865 and 6,146,595, with no remainder.
Since 6,146,595 cannot be divided by just 1 and 6,146,595, it is not a prime number.