A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2452450 can be evenly divided by 1 2 5 7 10 11 13 14 22 25 26 35 49 50 55 65 70 77 91 98 110 130 143 154 175 182 245 275 286 325 343 350 385 455 490 539 550 637 650 686 715 770 910 1,001 1,078 1,225 1,274 1,430 1,715 1,925 2,002 2,275 2,450 2,695 3,185 3,430 3,575 3,773 3,850 4,459 4,550 5,005 5,390 6,370 7,007 7,150 7,546 8,575 8,918 10,010 13,475 14,014 15,925 17,150 18,865 22,295 25,025 26,950 31,850 35,035 37,730 44,590 49,049 50,050 70,070 94,325 98,098 111,475 175,175 188,650 222,950 245,245 350,350 490,490 1,226,225 and 2,452,450, with no remainder.
Since 2,452,450 cannot be divided by just 1 and 2,452,450, it is not a prime number.