Yes and no?
Dimples are important for a golf ball because they help reduce drag, and thus, help the ball to fly further. Dimples are like tiny aerodynamic bumps that can help the air pass around the ball more efficiently.
The more aerodynamic a golf ball is, the farther it will fly. However, the overall design of the golf ball (including the dimples) has to be matched to the swing characteristics of the golfer in order to optimize performance.
For example, some golfers may do better with a dimple pattern that generates more spin, while others may do better with a dimple pattern that generates less spin.
Ultimately, it is up to the golfer to seek help from a PGA Professional to find the best dimple pattern for his or her swing.