Yes, all Shriners are Masons. Before a man can join the Shrine, he must first receive three "degrees" in his "Blue Lodge," or Home Lodge. After that any Mason can move on to one or more of the appendant bodies, including the Scottish Rite, York Rite, and Shrine. Masons may also affiliate with other Lodges. It should be noted that although these other Masonic bodies allow members to pursue advanced degrees and get more Masonic education, there is no "higher" degree than the 3rd, which is received in the Blue Lodge.
Are Shriners Masons?