A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4254750 can be evenly divided by 1 2 3 5 6 9 10 15 18 25 30 31 45 50 61 62 75 90 93 122 125 150 155 183 186 225 250 279 305 310 366 375 450 465 549 558 610 750 775 915 930 1,098 1,125 1,395 1,525 1,550 1,830 1,891 2,250 2,325 2,745 2,790 3,050 3,782 3,875 4,575 4,650 5,490 5,673 6,975 7,625 7,750 9,150 9,455 11,346 11,625 13,725 13,950 15,250 17,019 18,910 22,875 23,250 27,450 28,365 34,038 34,875 45,750 47,275 56,730 68,625 69,750 85,095 94,550 137,250 141,825 170,190 236,375 283,650 425,475 472,750 709,125 850,950 1,418,250 2,127,375 and 4,254,750, with no remainder.
Since 4,254,750 cannot be divided by just 1 and 4,254,750, it is not a prime number.