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34 votes
34 votes
Which of the following numbers is not a prime number?79 3 13

User Karan Gaur
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2 Answers

6 votes
6 votes
the answer is 9

7, 3, 13 can only be divided by one
9 can be divided by 1,3 and 9
User Allen More
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3.0k points
23 votes
23 votes

Prime numbers are the ones that can only be divided by two numbers: themselves and 1.

Let's analyze our options to see which one does not meet this condition:

7--> 7 can only be divided by 7 and 1 --> 7 is a prime number

9 --> 9 can be divided by 9, 1, and 3 --> 9 is not a prime number

3 --> 3 can only be divided by 3 and 1 --> 3 is a prime number

13 --> 13 can only be divided by 13 and 1 --> 13 is a prime number.

Answer: 9

User RBK
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2.9k points