Is he showing interest/flirting?

Key points -

He always talks to me when he sees me. He will wave when I come in each morning and say hi, he'll say hi and ask how I am when he sees me in the break room or during the day (even if he can't talk he still waves and smiles). He makes sure he's in the break room when I will be. He's now started calling me "trouble" in a playful manner. Like I came in the break room today and he goes "hello there trouble" and smiles then asks how I am. Then when I went to leave, he said "trouble" and smiled again. He also stares at me a lot.

Is he trying to flirt with me?

Is he showing interest/flirting?
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