Verses with the word square in the Old Testament (3 verses):

1 Kings 7:5
And all the doors and posts were square, with the windows: and light was against light in three ranks.

Ezekiel 43:16
And the altar shall be twelve cubits long, twelve broad, square in the four squares thereof.

Ezekiel 45:2
Of this there shall be for the sanctuary five hundred in length, with five hundred in breadth, square round about; and fifty cubits round about for the suburbs thereof.