A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9629550 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 25 27 30 35 42 45 50 54 63 70 75 90 105 126 135 150 175 189 210 225 270 315 350 378 450 525 630 675 945 1,019 1,050 1,350 1,575 1,890 2,038 3,057 3,150 4,725 5,095 6,114 7,133 9,171 9,450 10,190 14,266 15,285 18,342 21,399 25,475 27,513 30,570 35,665 42,798 45,855 50,950 55,026 64,197 71,330 76,425 91,710 106,995 128,394 137,565 152,850 178,325 192,591 213,990 229,275 275,130 320,985 356,650 385,182 458,550 534,975 641,970 687,825 962,955 1,069,950 1,375,650 1,604,925 1,925,910 3,209,850 4,814,775 and 9,629,550, with no remainder.
Since 9,629,550 cannot be divided by just 1 and 9,629,550, it is not a prime number.