Welcome to Android Central! Is the phone actually on, or is it powered off?
If it's on, try pressing and holding Power for about 30 seconds (and time it -- 30 seconds is actually a lot longer than you might think). This will hopefully force a shutdown. Then wait a few seconds, and power on again. Does it work now?
If it's already off and won't power on, then charge it on wall outlet for at least 6 hours undisturbed, then press and hold Power for about 30 seconds. Does it turn on?
And I probably don't have to tell you this now, but keep your device away from your kids from now on. Don't treat it like a toy, unless you're prepared to have it be broken by rough play!
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