Can this be considered a pure function (functional programming)?

I've been reading about functional programming and its concepts. It's clear to me that when working in big projects you always need to mix (at some adequate level) multiple paradigms such as OO and functional. In theory, concepts such as function purity are too strict such as

The function always evaluates the same result value given the same argument value(s). The function result value cannot depend on any hidden information or state that may change while program execution proceeds or between different executions of the program, nor can it depend on any external input from I/O devices. (https://en.wikipedia.org/wiki/Pure_function)

That said, is this (or can be considered) code a pure function?

const externalVar = 10;

function timesTen(value) {
    return externalVar * value;
}

I'm asking this because, in this case, the timesTen function will always return the same value for an input, and anyone can change the value of externalVar as this is a constant. However, this code breaks the rule of accessing external function's scope.