If you have one bright light you'll get a very distinct shadow from the hard light.
Depends on the size/relative size of the light - relative size includes how far away the subject is from it. Ultimately, every light has different falloff and output so an identical setup is only theoretical. That is to mean that in practice an LED will generally have much less output and a much quicker falloff meaning your subject will have to be closer to the light and the light will then be bigger relative to said subject, which in turn means that light is softer.
An 8-light molefay, for example, will actually be really soft close-up, but because of its high output we tend to place it much farther away, which ultimately hardens the light and gives it a reputation for being a 'hard' light.
Imagine a balloon light. These are generally very large when close the ground and so are extremely soft. If you allowed it to float off into the sky, and somehow had the ability to increase its output as it floated away (to ensure same exposure as it did so) the light would get harder as it got smaller and smaller relative to the subject.
The hardness/softness of a light is determined by the size of it, which includes relative size (which is what I mean when I say distance). I'm not sure exactly what the OP means by quantity, but more lights arrayed and diffused will ultimately create a softer light, as they will ultimately create a larger light.
If you have one bright light you'll get a very distinct shadow from the hard light.
If you have a 3x3 foot panel of 600 led bulbs you most certainly will not get the same hard shadow effect.
A 3x3 panel of 600 bare led bulbs will be a harder light source than a 3x3 panel single light source, all other things being equal. Now, the difference may or may not be marginal and it's difficult to compare directly because in the real world you'll be unlikely to find a situation where you need to, nor where you will have a situation where all things
are otherwise equal.