5. Which of the following numbers have only two factors?
(1) 73 (2) 75 (3) 77 (4) 81
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A number with only two factors is called a prime number. A number with more than two factors is called a composite number. The number 1 is neither prime nor composite. It has only one factor, itself
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Factors of 73: 1, 73
Factors of 75: 1, 3, 5, 15, 25, 75
Factors of 77: 1, 7, 11, 77
Factors of 81: 1, 3, 9, 27, 81
answer : 1)73
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