No.  The dictionary says it's an adjective or adverb.\n\nMany years ago, one of my English teachers taught\nme that a preposition is usually something you\ncan put in the phrase "____ the log".  For example:\n\n   on the log\n   under the log\n   behind the log\n   after the log\n\nbut not:\n\n   askew the log\n\nHope that helps.