Help Me..!! To Recover Instagram Account.

Hello Friends

#Part:1
Its Possible to recover Instagram Account which is Hacked. My friends told you can recover if you have primary email address. I want Answer from BHW.

#Part:2
If i buy Instagram account from someone now i want to find the email attached in account that is primary. Or other one added by someone how can i find that one. I want Answer from BHW.