Answer:
16
Step-by-step explanation:
<u>To solve this, we do the process of elimination.</u>
<u>First, let's consider all the numbers between 10 and 20.</u>
11, 12, 13, 14, 15, 16, 17, 18, 19
<u>Composite numbers</u><u> are numbers that have factors other than 1 and itself. </u><u>Prime numbers</u><u> are numbers whose only factors are 1 and itself. Let's keep the composite numbers.</u>
12, 14, 15, 16, 18
<u>Let's keep the even numbers as well.</u>
12, 14, 16, 18
<u>Only one of these numbers is "square". I'm assuing this means that the square root of this number is a whole number. The only number that fits this criteria is 16.</u>
16