A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7743582 can be evenly divided by 1 2 3 6 7 9 11 14 18 21 22 33 37 42 63 66 74 77 99 111 126 151 154 198 222 231 259 302 333 407 453 462 518 666 693 777 814 906 1,057 1,221 1,359 1,386 1,554 1,661 2,114 2,331 2,442 2,718 2,849 3,171 3,322 3,663 4,662 4,983 5,587 5,698 6,342 7,326 8,547 9,513 9,966 11,174 11,627 14,949 16,761 17,094 19,026 23,254 25,641 29,898 33,522 34,881 39,109 50,283 51,282 61,457 69,762 78,218 100,566 104,643 117,327 122,914 184,371 209,286 234,654 351,981 368,742 430,199 553,113 703,962 860,398 1,106,226 1,290,597 2,581,194 3,871,791 and 7,743,582, with no remainder.
Since 7,743,582 cannot be divided by just 1 and 7,743,582, it is not a prime number.