A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9366600 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 20 24 25 30 40 50 60 67 75 100 120 134 150 200 201 233 268 300 335 402 466 536 600 670 699 804 932 1,005 1,165 1,340 1,398 1,608 1,675 1,864 2,010 2,330 2,680 2,796 3,350 3,495 4,020 4,660 5,025 5,592 5,825 6,700 6,990 8,040 9,320 10,050 11,650 13,400 13,980 15,611 17,475 20,100 23,300 27,960 31,222 34,950 40,200 46,600 46,833 62,444 69,900 78,055 93,666 124,888 139,800 156,110 187,332 234,165 312,220 374,664 390,275 468,330 624,440 780,550 936,660 1,170,825 1,561,100 1,873,320 2,341,650 3,122,200 4,683,300 and 9,366,600, with no remainder.
Since 9,366,600 cannot be divided by just 1 and 9,366,600, it is not a prime number.