A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4590495 can be evenly divided by 1 3 5 7 9 13 15 19 21 35 39 45 57 59 63 65 91 95 105 117 133 171 177 195 247 273 285 295 315 399 413 455 531 585 665 741 767 819 855 885 1,121 1,197 1,235 1,239 1,365 1,729 1,995 2,065 2,223 2,301 2,655 3,363 3,705 3,717 3,835 4,095 5,187 5,369 5,605 5,985 6,195 6,903 7,847 8,645 10,089 11,115 11,505 14,573 15,561 16,107 16,815 18,585 23,541 25,935 26,845 34,515 39,235 43,719 48,321 50,445 70,623 72,865 77,805 80,535 102,011 117,705 131,157 218,595 241,605 306,033 353,115 510,055 655,785 918,099 1,530,165 and 4,590,495, with no remainder.
Since 4,590,495 cannot be divided by just 1 and 4,590,495, it is not a prime number.