Usage: 3 forms in 7 verses
Form Translated As     In Verse(s)
εξακισχιλίουσ six thousand LXX.2Kgs.5.5
εξακισχίλιοι six thousand LXX.Num.2.9LXX.Num.3.34LXX.1Chr.23.4LXX.Ezra.2.67LXX.Neh.7.69
εξακισχίλιαι six thousand LXX.Job.42.12

Liddell-Scott-Jones

ἑξακισχίλιοι (hexakischilioi) six thousand G:A

ἑξακισχίλιοι-χίλιοι [χῑ], αι, α,

six thousand, [Refs 5th c.BC+]: also ἑξᾰκῐχήλιοι, [Refs]