A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2450140 can be evenly divided by 1 2 4 5 7 10 11 14 20 22 28 35 37 43 44 55 70 74 77 86 110 140 148 154 172 185 215 220 259 301 308 370 385 407 430 473 518 602 740 770 814 860 946 1,036 1,204 1,295 1,505 1,540 1,591 1,628 1,892 2,035 2,365 2,590 2,849 3,010 3,182 3,311 4,070 4,730 5,180 5,698 6,020 6,364 6,622 7,955 8,140 9,460 11,137 11,396 13,244 14,245 15,910 16,555 17,501 22,274 28,490 31,820 33,110 35,002 44,548 55,685 56,980 66,220 70,004 87,505 111,370 122,507 175,010 222,740 245,014 350,020 490,028 612,535 1,225,070 and 2,450,140, with no remainder.
Since 2,450,140 cannot be divided by just 1 and 2,450,140, it is not a prime number.