A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3055050 can be evenly divided by 1 2 3 5 6 9 10 15 18 25 27 30 31 45 50 54 62 73 75 90 93 135 146 150 155 186 219 225 270 279 310 365 438 450 465 558 657 675 730 775 837 930 1,095 1,314 1,350 1,395 1,550 1,674 1,825 1,971 2,190 2,263 2,325 2,790 3,285 3,650 3,942 4,185 4,526 4,650 5,475 6,570 6,789 6,975 8,370 9,855 10,950 11,315 13,578 13,950 16,425 19,710 20,367 20,925 22,630 32,850 33,945 40,734 41,850 49,275 56,575 61,101 67,890 98,550 101,835 113,150 122,202 169,725 203,670 305,505 339,450 509,175 611,010 1,018,350 1,527,525 and 3,055,050, with no remainder.
Since 3,055,050 cannot be divided by just 1 and 3,055,050, it is not a prime number.