The Committee of Conundrums: Irresolvable Quiz Question 3

Here is the third and final question in our series of Irresolvable Quiz Questions.

What is the square root of the sum of the prime factors of the answer to the previous question?

(Note: The previous question was not actually answerable, so you're on your own here.)

Or, if you'd rather not think about math, visit our Philosophical Ramblings page for some existential dread.