What does Isaiah 39:3 mean?

Then Isaiah the prophet came to King Hezekiah and asked, 'What did those men say, and where did they come from?' Hezekiah answered, 'They came from a far country—from Babylon.' Isaiah 39:3 - Modern Text Bible

(Isaiah questions Hezekiah about the visitors, prompting Hezekiah to admit they came from Babylon.)