A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5709660 can be evenly divided by 1 2 3 4 5 6 10 11 12 15 20 22 30 33 41 44 55 60 66 82 110 123 132 164 165 205 211 220 246 330 410 422 451 492 615 633 660 820 844 902 1,055 1,230 1,266 1,353 1,804 2,110 2,255 2,321 2,460 2,532 2,706 3,165 4,220 4,510 4,642 5,412 6,330 6,765 6,963 8,651 9,020 9,284 11,605 12,660 13,530 13,926 17,302 23,210 25,953 27,060 27,852 34,604 34,815 43,255 46,420 51,906 69,630 86,510 95,161 103,812 129,765 139,260 173,020 190,322 259,530 285,483 380,644 475,805 519,060 570,966 951,610 1,141,932 1,427,415 1,903,220 2,854,830 and 5,709,660, with no remainder.
Since 5,709,660 cannot be divided by just 1 and 5,709,660, it is not a prime number.