Is this a sign a guy is interested?

So whenever I go into like a bar type scene and take scan around the room, I always find a few cute guys who would make eye contact with me for a quick second or two. Most other guys either won't see me or they just take a random glance at me than just swiftly look away. The last time I was at the bar, 3 cute young guys were sitting there having beers. I was talking to my friend and I turned my head once to look at one of them. Then swiftly looked away. Suddenly when I looked back, all 3 of them were looking directly at me (they knew i checked one of them out). I dont know if that is a sign of interest or if they are just randomly looking.

Is this a sign a guy is interested?
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