What do you mean by "separate the list"?
Perhaps this?
candidates = Select[Permutations[Range[9]], Compute]
{FromDigits[#[[1 ;; 5]]], FromDigits[#[[6 ;;]]]} & /@ candidates //
AssociationMap[Divide[First@#, Last@#] &] // Sort
(*
<|{13458, 6729} -> 2, {13584, 6792} -> 2, {13854, 6927} ->
2, {14538, 7269} -> 2, {14586, 7293} -> 2, {14658, 7329} ->
2, {15384, 7692} -> 2, {15846, 7923} -> 2, {15864, 7932} ->
2, {18534, 9267} -> 2, {18546, 9273} -> 2, {18654, 9327} ->
2, {17469, 5823} -> 3, {17496, 5832} -> 3, {15768, 3942} ->
4, {17568, 4392} -> 4, {23184, 5796} -> 4, {31824, 7956} ->
4, {13485, 2697} -> 5, {13845, 2769} -> 5, {14685, 2937} ->
5, {14835, 2967} -> 5, {14865, 2973} -> 5, {16485, 3297} ->
5, {18645, 3729} -> 5, {31485, 6297} -> 5, {38145, 7629} ->
5, {46185, 9237} -> 5, {48135, 9627} -> 5, {48615, 9723} ->
5, {17658, 2943} -> 6, {27918, 4653} -> 6, {34182, 5697} ->
6, {16758, 2394} -> 7, {18459, 2637} -> 7, {31689, 4527} ->
7, {36918, 5274} -> 7, {37926, 5418} -> 7, {41832, 5976} ->
7, {53298, 7614} -> 7, {25496, 3187} -> 8, {36712, 4589} ->
8, {36728, 4591} -> 8, {37512, 4689} -> 8, {37528, 4691} ->
8, {38152, 4769} -> 8, {41896, 5237} -> 8, {42968, 5371} ->
8, {46312, 5789} -> 8, {46328, 5791} -> 8, {46712, 5839} ->
8, {47136, 5892} -> 8, {47328, 5916} -> 8, {47368, 5921} ->
8, {51832, 6479} -> 8, {53928, 6741} -> 8, {54312, 6789} ->
8, {54328, 6791} -> 8, {54712, 6839} -> 8, {56984, 7123} ->
8, {58496, 7312} -> 8, {58912, 7364} -> 8, {59328, 7416} ->
8, {59368, 7421} -> 8, {63152, 7894} -> 8, {63528, 7941} ->
8, {65392, 8174} -> 8, {65432, 8179} -> 8, {67152, 8394} ->
8, {67352, 8419} -> 8, {67512, 8439} -> 8, {71456, 8932} ->
8, {71536, 8942} -> 8, {71624, 8953} -> 8, {71632, 8954} ->
8, {73248, 9156} -> 8, {73264, 9158} -> 8, {73456, 9182} ->
8, {74528, 9316} -> 8, {74568, 9321} -> 8, {74816, 9352} ->
8, {75328, 9416} -> 8, {75368, 9421} -> 8, {76184, 9523} ->
8, {76248, 9531} -> 8, {76328, 9541} -> 8, {57429, 6381} ->
9, {58239, 6471} -> 9, {75249, 8361} -> 9, {45792, 3816} ->
12, {73548, 6129} -> 12, {89532, 7461} -> 12, {91584, 7632} ->
12, {67392, 5184} -> 13, {81549, 6273} -> 13, {94653, 7281} ->
13, {25746, 1839} -> 14, {27384, 1956} -> 14, {41538, 2967} ->
14, {46158, 3297} -> 14, {51492, 3678} -> 14, {54768, 3912} ->
14, {61572, 4398} -> 14, {65982, 4713} -> 14, {27945, 1863} ->
15, {92745, 6183} -> 15, {45936, 2871} -> 16, {73296, 4581} ->
16, {98352, 6147} -> 16, {26843, 1579} -> 17, {28543, 1679} ->
17, {29546, 1738} -> 17, {36958, 2174} -> 17, {45713, 2689} ->
17, {45781, 2693} -> 17, {54689, 3217} -> 17, {59126, 3478} ->
17, {64957, 3821} -> 17, {65297, 3841} -> 17, {67184, 3952} ->
17, {67218, 3954} -> 17, {76823, 4519} -> 17, {76891, 4523} ->
17, {78132, 4596} -> 17, {78523, 4619} -> 17, {78591, 4623} ->
17, {81532, 4796} -> 17, {83572, 4916} -> 17, {83657, 4921} ->
17, {89437, 5261} -> 17, {89471, 5263} -> 17, {89641, 5273} ->
17, {91426, 5378} -> 17, {92837, 5461} -> 17, {92871, 5463} ->
17, {93126, 5478} -> 17, {28674, 1593} -> 18, {51984, 2736} ->
19, {81567, 4293} -> 19, {51678, 2349} -> 22, {36294, 1578} ->
23, {81627, 3549} -> 23, {81972, 3564} -> 23, {39528, 1647} ->
24, {46872, 1953} -> 24, {42978, 1653} -> 26, {56498, 2173} ->
26, {61854, 2379} -> 26, {67314, 2589} -> 26, {67418, 2593} ->
26, {76518, 2943} -> 26, {82654, 3179} -> 26, {89726, 3451} ->
26, {92846, 3571} -> 26, {39852, 1476} -> 27, {49572, 1836} ->
27, {69741, 2583} -> 27, {96714, 3582} -> 27, {75348, 2691} ->
28, {37584, 1296} -> 29, {73689, 2541} -> 29, {75168, 2349} ->
32, {48265, 1379} -> 35, {63945, 1827} -> 35, {64295, 1837} ->
35, {74865, 2139} -> 35, {93485, 2671} -> 35, {65934, 1782} ->
37, {65892, 1734} -> 38, {74328, 1956} -> 38, {93654, 2178} ->
43, {58476, 1329} -> 44, {59268, 1347} -> 44, {67892, 1543} ->
44, {69432, 1578} -> 44, {95348, 2167} -> 44, {58374, 1269} ->
46, {95472, 1836} -> 52, {65879, 1243} -> 53, {75896, 1432} ->
53, {84376, 1592} -> 53, {92538, 1746} -> 53, {73986, 1254} ->
59, {79546, 1283} -> 62, {94736, 1528} -> 62, {83754, 1269} ->
66, {98736, 1452} -> 68|>
*)