A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3670980 can be evenly divided by 1 2 3 4 5 6 10 12 15 17 20 30 34 51 59 60 61 68 85 102 118 122 170 177 183 204 236 244 255 295 305 340 354 366 510 590 610 708 732 885 915 1,003 1,020 1,037 1,180 1,220 1,770 1,830 2,006 2,074 3,009 3,111 3,540 3,599 3,660 4,012 4,148 5,015 5,185 6,018 6,222 7,198 10,030 10,370 10,797 12,036 12,444 14,396 15,045 15,555 17,995 20,060 20,740 21,594 30,090 31,110 35,990 43,188 53,985 60,180 61,183 62,220 71,980 107,970 122,366 183,549 215,940 244,732 305,915 367,098 611,830 734,196 917,745 1,223,660 1,835,490 and 3,670,980, with no remainder.
Since 3,670,980 cannot be divided by just 1 and 3,670,980, it is not a prime number.