No, it is not. (I'm presuming you're talking about the one made famous by Barry Manilow, which was written by Bruce Johnston.) According to the ASCAP website, copyright for that song is administered...
The writers were: lyrics by S. Fillmore Bennett and music by Joseph P. Webster. The song was copyrighted in 1868 by Lyon and Healy. The copyright is expired but the versions recorded would still have...