A string in JS is not an object, why does it have properties and methods?

Question

Solid State Drives

I'm learning JS from scratch, help dispel some misunderstandings.
A string in JS is not an object, why does it have properties (str.length) and methods (str.charAt(pos))?
Aren't properties and methods unique to objects?

obj = {
properties: 'some properties',
method : someMethod()
}

And how in that case generally to distinguish properties and methods?

Answer 1

And what worries you? This is a counter.
www.ixbt.com/storage/hdd-smart-testing.shtml

Answer 2

When accessing the properties of primitives, a temporary object of the corresponding type is created and its property/method is called. (For sure, in engines everything is much more complicated and there are a lot of optimizations, but from the point of view of use it doesn’t matter)
> And how, in this case, to distinguish between properties and methods in general
No way. Methods are just function properties.