A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2480310 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 30 31 35 42 45 62 63 70 90 93 105 126 127 155 186 210 217 254 279 310 315 381 434 465 558 630 635 651 762 889 930 1,085 1,143 1,270 1,302 1,395 1,778 1,905 1,953 2,170 2,286 2,667 2,790 3,255 3,810 3,906 3,937 4,445 5,334 5,715 6,510 7,874 8,001 8,890 9,765 11,430 11,811 13,335 16,002 19,530 19,685 23,622 26,670 27,559 35,433 39,370 40,005 55,118 59,055 70,866 80,010 82,677 118,110 137,795 165,354 177,165 248,031 275,590 354,330 413,385 496,062 826,770 1,240,155 and 2,480,310, with no remainder.
Since 2,480,310 cannot be divided by just 1 and 2,480,310, it is not a prime number.