Yes, 13% of the bottle is alcohol, the rest is what is left of the grape juice that the wine started as.
But while you’re here, there are two ways of figuring the percentage: alcohol by volume (ABV), or alcohol by weight. Because alcohol is lighter than water, 13% alcohol by volume would be only 10.3% alcohol by weight.
As long as you always use the same measure, it’s not important, but the US tends to use alcohol by weight, so their wines are listed as weaker but may be just as strong or stronger.
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