Question

Which of the numbers below have exactly 3 divisors

• A. 81
• B. 64
• C. 121
• D. 144

Answer 1

Answer:

C. 121

81 = 1, 3, 9, 27, 81 64 = 1, 2, 4, 8, 16, 32, 64 121 = 1, 11, 121 144 = 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144