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Donald Trump looks alive and well ... this after ridiculous online rumors have been circling about his current status -- and even questioning if he's alive.

The prez was seen boarding his motorcade on the South Lawn of the White House Saturday morning with his granddaughter, Kai , as they headed to Trump National Golf Club in Sterling, Virginia. Getty

The two look geared up for a morning of golf ... with Donald rocking a MAGA hat and polo, while Kai wears a black long-sleeve shirt and matching cap. Getty

Trump's grandson, Spencer , looks ready to tag along ... sporting a polo of his own.

As for the online rumors ... conspiracy theorists ran wild Friday night on social media, speculating about Trump's whereabouts and health -- with #whereistrump becoming a trending

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