Nope. As an example, let's take your car.
An engine is necessary for your car to work as a car, but it is not sufficient -- you also need gas, tires, and so on.
In the case of Scripture, I agree with you that it's "necessary". Even according to Scripture, however, it is not sufficient.
Nope. Necessary in terms of the car would include all that was required to make it go. That would be parts, accessories, fuel, etc. that are “necessary.”
Had an older gentleman in one of the churches early in my ministry who would always include in his prayers a line about God granting us what we need, but not necessarily what we wanted.
He realized that what we “needed” would get us there. He also recognized that some of the perks were nice, but they weren’t needed.