Yes, just like any other website, they can see if you just copy and paste answers. The purpose of this site is too help people grasp an idea of the concept of what their learning. To give an example, an area of mathematics. Personally, I am on this website to help increase people's learning but also too learn new things myself through reading others answers.
But most of the time, you should be fine, it is considered cheating if you just do not try to get a deeper understanding and just go for an easy way out.
Hope this helps,
ROR
