exam Maths Puzzle Numerical Ability

How many numbers between 100 and 200 (Inclusive) have an even number of factors?

Is there a formula for figuring this out or some sort of pattern? Thankyou

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exam Other Question

Let n denote an integer greater than 1. Which of the following statements are true?
i. if 2^n -1 is prime, then n is prime
ii. if n is prime, then 2^n - 1 is prime
iii. if 2^n - 2x^2 - x - 3/3x^2 + 7x +4 . 3x^2 - 11x -20/4x^2 - 9