Does someone know my apple password?

Hi, I've recently got stolen an iPhone 6 and it was locked with a password and anything, but the good news, my insurance covered it and upgraded me to a 6s. The issue is that after I got my new iPhone, I've set up my apple ID and everything, and I've been seeing random apps being installed in my phone… I don't install any of the apps that show up in my phone but all of a sudden I see 10 new apps or something like that in my phone. Do you think this person knows my password?

Added (1). Do you think someone knows my password?

So change your password. Jeez its common sense to figure out.

How can someone know your password? I don't think they can hack the App Store so they can't install new apps. I'm not sure how this is happening.

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