Prime Composite Square and Triangular Numbers

Which of these numbers is prime?

• 29
• 39
• 85
• 51

Which number below is composite?

• 23
• 37
• 49
• 71

The prime factorization 2 × 3 × 3 × 5 equals which number?

• 30
• 45
• 90
• 135

Multiply the smallest prime number by the largest single‑digit prime number. Which option matches the product?

• 14
• 16
• 18
• 22

What is the sum of first two prime numbers?

• 4
• 5
• 6
• 7

The number 64 is which type of number?

• Square number
• Triangular number
• Prime number
• Odd number

Which option lists only prime numbers?

• 2, 5, 11
• 4, 9, 15
• 6, 7, 12
• 3, 8, 13

Which of these numbers is both a square and a triangular number?

• 1
• 9
• 16
• 36

Add the first four triangular numbers. Which option shows the sum?

• 18
• 19
• 20
• 21

Which number is both a square number and an even number?

• 9

• 25

• 36

• 15