A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7344675 can be evenly divided by 1 3 5 9 13 15 25 27 31 39 45 65 75 81 93 117 135 155 195 225 243 279 325 351 403 405 465 585 675 729 775 837 975 1,053 1,209 1,215 1,395 1,755 2,015 2,025 2,325 2,511 2,925 3,159 3,627 3,645 4,185 5,265 6,045 6,075 6,975 7,533 8,775 9,477 10,075 10,881 12,555 15,795 18,135 18,225 20,925 22,599 26,325 30,225 32,643 37,665 47,385 54,405 62,775 78,975 90,675 97,929 112,995 163,215 188,325 236,925 272,025 293,787 489,645 564,975 816,075 1,468,935 2,448,225 and 7,344,675, with no remainder.
Since 7,344,675 cannot be divided by just 1 and 7,344,675, it is not a prime number.