Algebra Level 2

We know that for all positive integers $$X$$, the following equation is true.

$2^X = \underbrace{2\times 2\times 2\times \cdots \times 2}_{\text{Number of 2's } =X}$

What number goes into the following box such that the equation below is also true for all positive integers $$X$$?

$\boxed{\phantom0}^X = \underbrace{2\times 2\times 2\times \cdots \times 2}_{\text{Number of 2's } =4X}$

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