No, it isn’t. You generally say, `Come here’, and not `come to here’. There are a number of common words in English, such as `here’, `there’, `home’, `up’, `down’, `upstairs’, and `downstairs’ which are not preceded by the word `to’.
Examples: The children ran upstairs/downstairs. (Not `ran to upstairs/downstairs’) *The CEO asked us to come here. (Not `come to here’)