Which of the following is not a prime number?

Prepare for the Certify Teacher Math Exam with multiple choice questions, detailed explanations, and practice quizzes. Boost your confidence and ace your test!

Multiple Choice

Which of the following is not a prime number?

A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself. The numbers 2, 3, and 5 all meet this criterion: they are greater than 1 and cannot be divided evenly by any other numbers aside from 1 and themselves. On the other hand, the number 1 does not satisfy the definition of a prime number, as it is not greater than 1. In fact, it is classified as a unit, meaning it has only one positive divisor, which is itself. Therefore, while 2, 3, and 5 are all prime numbers, 1 is not considered prime, making it the correct answer to the question.

A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself. The numbers 2, 3, and 5 all meet this criterion: they are greater than 1 and cannot be divided evenly by any other numbers aside from 1 and themselves.

On the other hand, the number 1 does not satisfy the definition of a prime number, as it is not greater than 1. In fact, it is classified as a unit, meaning it has only one positive divisor, which is itself. Therefore, while 2, 3, and 5 are all prime numbers, 1 is not considered prime, making it the correct answer to the question.

More practice questions