A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7163580 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 23 29 30 46 58 60 69 87 92 115 116 138 145 174 179 230 276 290 345 348 358 435 460 537 580 667 690 716 870 895 1,074 1,334 1,380 1,740 1,790 2,001 2,148 2,668 2,685 3,335 3,580 4,002 4,117 5,191 5,370 6,670 8,004 8,234 10,005 10,382 10,740 12,351 13,340 15,573 16,468 20,010 20,585 20,764 24,702 25,955 31,146 40,020 41,170 49,404 51,910 61,755 62,292 77,865 82,340 103,820 119,393 123,510 155,730 238,786 247,020 311,460 358,179 477,572 596,965 716,358 1,193,930 1,432,716 1,790,895 2,387,860 3,581,790 and 7,163,580, with no remainder.
Since 7,163,580 cannot be divided by just 1 and 7,163,580, it is not a prime number.