A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7483245 can be evenly divided by 1 3 5 7 11 15 19 21 31 33 35 55 57 77 93 95 105 121 133 155 165 209 217 231 285 341 363 385 399 465 589 605 627 651 665 847 1,023 1,045 1,085 1,155 1,463 1,705 1,767 1,815 1,995 2,299 2,387 2,541 2,945 3,135 3,255 3,751 4,123 4,235 4,389 5,115 6,479 6,897 7,161 7,315 8,835 11,253 11,495 11,935 12,369 12,705 16,093 18,755 19,437 20,615 21,945 26,257 32,395 34,485 35,805 45,353 48,279 56,265 61,845 71,269 78,771 80,465 97,185 131,285 136,059 213,807 226,765 241,395 356,345 393,855 498,883 680,295 1,069,035 1,496,649 2,494,415 and 7,483,245, with no remainder.
Since 7,483,245 cannot be divided by just 1 and 7,483,245, it is not a prime number.