No, "according" is not a linking verb. A linking verb is a verb that connects the subject of a sentence to a subject complement, which can be a noun or an adjective that describes or identifies the subject. Common linking verbs include "be," "seem," "become," "appear," and "feel."
"According" is typically used as a preposition in phrases like "according to" to indicate a source or basis for information. For example, in the sentence "According to the report, sales have increased," "according to" shows the source of the information about the sales increase.