NO! Eating above your caloric maintenance will make you gain weight! Protein powder is not a magical formula that will randomly add muscles and weight to your frame. I know this is a common myth among girls… we see muscley boys downing protein shakes, we put 2 and 2 together and jump to conclusions.
Protein powder is a pre-digested form of nutrients. The amino acids in protein powder help to rebuild the muscle you break down in the gym. Remember, the gym is the STIMULUS for change, where you break down the muscle.. it is with proper nutrition and sleep afterward that your body rebuilds the muscles stronger! Always have a protein shake after you lift weights so you replenish your body with the nutrients it needs!