A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7247394 can be evenly divided by 1 2 3 6 7 9 11 14 18 21 22 27 33 42 49 54 63 66 77 81 83 98 99 126 147 154 162 166 189 198 231 249 294 297 378 441 462 498 539 567 581 594 693 747 882 891 913 1,078 1,134 1,162 1,323 1,386 1,494 1,617 1,743 1,782 1,826 2,079 2,241 2,646 2,739 3,234 3,486 3,969 4,067 4,158 4,482 4,851 5,229 5,478 6,237 6,391 6,723 7,938 8,134 8,217 9,702 10,458 12,201 12,474 12,782 13,446 14,553 15,687 16,434 19,173 24,402 24,651 29,106 31,374 36,603 38,346 43,659 44,737 47,061 49,302 57,519 73,206 73,953 87,318 89,474 94,122 109,809 115,038 134,211 147,906 172,557 219,618 268,422 329,427 345,114 402,633 517,671 658,854 805,266 1,035,342 1,207,899 2,415,798 3,623,697 and 7,247,394, with no remainder.
Since 7,247,394 cannot be divided by just 1 and 7,247,394, it is not a prime number.