No, the president is not an officer of the United States.

The president is in the impeachment Article 2 Section 4 and not in the 14th Amendment. Why would they leave the president out of the 14th Amendment when Congress is in it. The 14th Amendment even lists state legislature and judicial officers, but it doesn't bother to list the president. Also in the Supreme Court case of Free Enterprise Fund V. Public Accounting Oversight Bid, Chief Justice Roberts wrote "The people do not vote for the Officers of The United States. Rather Officers of the United States are appointed exclusively pursuant to Article 2 Section 2 procedures.