The answer is generally no (in formal writing it is probably good to avoid using the split infinitive).
The split infinitive is a grammatical construction in which a word or phrase, usually an adverb or adverbial phrase, occurs between the marker to and the bare infinitive (uninflected) form of a verb. (From Wikipedia, the free encyclopedia)
A famous split infinitive is: “TO BOLDLY GO WHERE NO MAN HAS GONE BEFORE”
Boldly (the adverb) splits to go (the full infinitive).
