The Great Gatsby, "I took one look at him"

I'd like to know if "I took one look at him" in the chapter 4 of The Great Gatsby means "to have a quick glance" or "to stare / gaze at":

A small flat-nosed Jew raised his large head and regarded me with two fine growths of hair which luxuriated in either nostril. After a moment I discovered his tiny eyes in the half-darkness.

“—So I took one look at him,” said Mr. Wolfsheim, shaking my hand earnestly, “ —and what do you think I did?”

Thank you.