A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7623480 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 17 20 24 30 34 37 40 51 60 68 74 85 101 102 111 120 136 148 170 185 202 204 222 255 296 303 340 370 404 408 444 505 510 555 606 629 680 740 808 888 1,010 1,020 1,110 1,212 1,258 1,480 1,515 1,717 1,887 2,020 2,040 2,220 2,424 2,516 3,030 3,145 3,434 3,737 3,774 4,040 4,440 5,032 5,151 6,060 6,290 6,868 7,474 7,548 8,585 9,435 10,302 11,211 12,120 12,580 13,736 14,948 15,096 17,170 18,685 18,870 20,604 22,422 25,160 25,755 29,896 34,340 37,370 37,740 41,208 44,844 51,510 56,055 63,529 68,680 74,740 75,480 89,688 103,020 112,110 127,058 149,480 190,587 206,040 224,220 254,116 317,645 381,174 448,440 508,232 635,290 762,348 952,935 1,270,580 1,524,696 1,905,870 2,541,160 3,811,740 and 7,623,480, with no remainder.
Since 7,623,480 cannot be divided by just 1 and 7,623,480, it is not a prime number.