Create a function that returns the prime factorization of a number as a sorted list of arrays. Include the multiplicity of each prime in the arrays:
getPrimeFactorization(4) ➞ [[2, 2]]
getPrimeFactorization(10) ➞ [[2, 1], [5, 1]]
getPrimeFactorization(60) ➞ [[2, 2], [3, 1], [5, 1]]