No, it means E equals m c squared. To square, in mathematics means that something is multiplied by itself. So, E equals m c squared means that energy (E) equals mass (m) times [the speed of light times the speed of light] (c squared).
I wasn't trying to be lazy, I have a bed time time, and I clicked this link like a minute before it. My mom would have had my head if I was late. I promise you I normally read the thread before I answer. Being my age is a hard job. xD