No, you do not need an appraiser. The price is what the artist is asking for it. Contact the artist. Go to his page, the link I gave you and then contact the artist.
From looking at his other prices it would cost you at least that amount and maybe three times that amount to get it appraised. Why would want to do that?
Here is the link to his home page. Click where it says Contact and ask him any questions you would like. The same one Carmen gave you above.
https://fineartamerica.com/profiles/harmon-montgomery/art/paintings