A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5254500 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 25 30 31 50 60 62 75 93 100 113 124 125 150 155 186 226 250 300 310 339 372 375 452 465 500 565 620 678 750 775 930 1,130 1,356 1,500 1,550 1,695 1,860 2,260 2,325 2,825 3,100 3,390 3,503 3,875 4,650 5,650 6,780 7,006 7,750 8,475 9,300 10,509 11,300 11,625 14,012 14,125 15,500 16,950 17,515 21,018 23,250 28,250 33,900 35,030 42,036 42,375 46,500 52,545 56,500 70,060 84,750 87,575 105,090 169,500 175,150 210,180 262,725 350,300 437,875 525,450 875,750 1,050,900 1,313,625 1,751,500 2,627,250 and 5,254,500, with no remainder.
Since 5,254,500 cannot be divided by just 1 and 5,254,500, it is not a prime number.