A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1170180 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 27 30 33 36 44 45 54 55 60 66 90 99 108 110 132 135 165 180 197 198 220 270 297 330 394 396 495 540 591 594 660 788 985 990 1,182 1,188 1,485 1,773 1,970 1,980 2,167 2,364 2,955 2,970 3,546 3,940 4,334 5,319 5,910 5,940 6,501 7,092 8,668 8,865 10,638 10,835 11,820 13,002 17,730 19,503 21,276 21,670 26,004 26,595 32,505 35,460 39,006 43,340 53,190 58,509 65,010 78,012 97,515 106,380 117,018 130,020 195,030 234,036 292,545 390,060 585,090 and 1,170,180, with no remainder.
Since 1,170,180 cannot be divided by just 1 and 1,170,180, it is not a prime number.