Yes, God is immortal.
According to the reference, the Bible explicitly states God's immortality. Paul refers to God as the "King eternal, immortal, invisible, the only God" (1 Tim. 1:17). Further, 1 Timothy 6:16 describes God as the one "who alone has immortality and dwells in unapproachable light, whom no man has ever seen or can see."
Therefore, the referenced material unequivocally confirms God's immortality.