Prime and Composite STAAR Released Questions

Prime numbers have:

• Exactly 2 factors
• 2 pairs of factors
• More than 2 factors
• 1 factor

Composite numbers have:

• Exactly 2 factors
• 2 pairs of factors
• More than 2 factors
• 1 factor

Which number is NOT a prime number?

• 2

• 3

• 4

• 5

Which number IS a composite number?

• 11
  

• 13
• 21
• 23

Which number IS a prime number?

• 15
• 17
• 21
• 39

Is 43 a prime or composite number?

• Prime
• Composite

Is 63 a prime or composite number?

• Prime
• Composite

Is 100 a prime or composite number?

• Prime
• Composite

Is 99 a prime or composite number?

• Prime
• Composite

What are all prime numbers divisible by?

• 1, 2, and itself
• 1 and itself
• Every number from 1-10
• They aren't divisable at all