the tetragrammaton is NOT in this verse. The Greek word is κυριου
¶It happened, when king Hezekiah heard it, that he tore his clothes,
covered himself with sackcloth, and went into Yahweh’s house.and
it happened when Hezekiah the king heard, he tore his garments and put on
sackcloth and ascended into the House of the Lord.
Kata Biblon