All is hackable, above all if it is a online system.
But i think that is not easy to hack the bitcoin system, and the team is constantly work to make secure their systems
Ofcourse, Everything inside the Cyber world and internet are hackable. Even bank accounts and the websites of Banks here the Philippines such as Bangko De Oro and Bank of the Philippine Islands has been hacked some of their credit card accounts. Well, I will say that Bitcoin is hackeable but, It depends upon you on how you secure your Bitcoin wallet and your money/Bitcoins. Alwayd remember that "NO SYSTEM IS SAFE!".