Was Christopher Columbus a conquistador?
Christopher Columbus was not a Conquistador. He was a Christian Evangelist. He believed that God told him that the America's existed (when everyone else did not) and that He should go evangelize the unevangelized nations there.
See Book of Prophecies written by Christopher Columbus.
The first conquistador parties did not come until the early 1500's well after Christopher Columbus's fourth voyage into the new world in the year 1502.