Was President Andrew Johnson impeached by Congress?

Yes and No. The House of Representative is the only chamber of Congress that can bring articles of impeachment against a government official. If the House votes to impeach, which means "indict or charge," then the official proceeds to trial in the Senate, where he (or she) is either convicted or acquitted.

Andrew Johnson was impeached by the House of Representatives on February 24, 1868, but was acquitted by a single vote in the Senate. So yes, he was impeached (charged with wrongdoing), but only by the House of Representatives, not by the entire Congress. And no, since the Senate failed to convict (found guilty) the President, he was not removed from office.

President Johnson served out the remained of his term and left office on March 4, 1869.

Remember, when referring to the Legislative branch, that Congress is a collective term for both the House of Representatives and the Senate. Each has a role in the impeachment and trial process, but only the House of Representatives can impeach (not Congress, as a whole). This is a subtle, but important, distinction.