Prime Number Identification: Testing Number Properties

Which of the numbers is a prime number?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Choose the prime numbers
00:03 A prime number is only divisible by itself and 1
00:07 Therefore, if the number is divisible by another factor, it is not prime
00:28 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Which of the numbers is a prime number?

2

Step-by-step solution

To solve this problem, we identify which of the given numbers is a prime number.

Let's evaluate each provided number:

  • 13 13 : This number is only divisible by 1 and 13 itself. Therefore, 13 is a prime number.

  • 12 12 : This number is divisible by 1, 2, 3, 4, 6, and 12. Since it has divisors other than 1 and itself, it is not prime.

  • 15 15 : This number is divisible by 1, 3, 5, and 15. Since it has divisors other than 1 and itself, it is not prime.

  • 4 4 : This number is divisible by 1, 2, and 4. Since it has divisors other than 1 and itself, it is not prime.

Therefore, the only prime number among the choices is 13 13 .

3

Final Answer

13 13

Practice Quiz

Test your knowledge with interactive questions

Is the number equal to \( n \) prime or composite?

\( n=10 \)

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