You can only turn it off or uninstall it if you are rooted. You don't have to use it though. Clear your defaults so that no app is trying to open it and then pick a browser you like.
Btw, if you want a browser that conserves both data and battery, look at Opera Mini (mini - not mobile - is important). It uses opera's servers to do the heavy lifting and caching. But this means it won't work with all content. But you can install it and see how it works with the pages you visit most.
For me, it uses less than half the power consumption and less than half the data as any other browser I've tried. Since I got the Note 3 I only use it when I'm really trying to conserve those things though because I like to use the S-pen and gesture features of the stock browser.