Hi Demas. This question is similar to the old "not all rectangles are squares, but all squares are rectangles." All Mormons are Christians, but not all Christians are Mormons.
I grew up with a Mormon best friend, and leaned much of their culture. Mormons and other Christians worship the same God, but with several differences. Mormons emphasize the importance of hard work, often believing it earns them a place in heaven, while other denominations tend to view heaven as promised to anyone who accepts Jesus. Mormons believe in the visions of their founder, Joseph Smith, while other Christians are more skeptical.
Further differences exist but I'll leave those for another time.