The image is asking to categorize the numbers as Prime, Composite, or Neither. Let's analyze the remaining number (20) and categorize it.

1. Prime numbers are integers greater than 1 that have only two distinct divisors: 1 and themselves.
2. Composite numbers are integers greater than 1 that have more than two divisors.
3. Neither applies to numbers like 1 (neither prime nor composite) or non-integers.

Number 20:

• Divisors of 20: 1, 2, 4, 5, 10, 20
• Since 20 has more than two divisors, it is Composite.

Final Categorization:

• Prime: 17, 19
• Composite: 16, 18, 20
• Neither: (Empty in this case)

Would you like further explanation on prime and composite numbers? Here are five questions for extended exploration:

1. What are the properties of prime numbers, and why are they important in mathematics?
2. Can you explain why the number 1 is neither prime nor composite?
3. How can you efficiently test whether a large number is prime or composite?
4. What is the significance of composite numbers in real-world applications?
5. How does the concept of "Neither" apply to other mathematical classifications?

Tip: Remember, the number 2 is the only even prime number! All other even numbers are composite.