What iPhone is this and its jailbreak or no?

I have a used iphone 4 (I think) - but I'm not sure if its an iphone 4 or not
The back cover of it shows A 1332 and the model of it under "Settings" is MC608LL

Would anyone be able to confirm if this is an iphone 4 or not?

One last question: how do I know if iphone is unlocked by apple and not jailbreak?
Because it doesn't have those applications that jailbreak iphones has like Cydia etc

It's iPhone 4 GSM Model.
You can give it a reset to assure yourself that it doesn't have a jailbreak.