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Nope. Fruit juice is mostly water. Even raw sugar is only 380 kcal/g, just a bit more than French fries (310 kcal/g).

If you're underweight, you should eat food.

Something about your numbers seem way, way off (by two orders of magnitude, actually). Could you explain better or point to references?

I think it's per 100g, not per g.

Edit: yeah. That's how dietary references are done lots of non-US places. https://www.wolframalpha.com/input/?i=calories+in+100g+of+su...