Certify Teacher Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which of the following is not classified as a prime number?

1

A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself. This means that a prime number can only be divided evenly by 1 and the number itself, showcasing its indivisibility by any other numbers.

The number 1 does not meet the criteria for being a prime number because it is not greater than 1. It only has one positive divisor, which is itself, and hence does not fit the definition of having exactly two distinct positive divisors. On the other hand, the numbers 2, 3, and 17 are all greater than 1 and can only be evenly divided by 1 and themselves, making them prime.

2 is the smallest and the only even prime number, 3 is the next smallest prime number, and 17 is also a prime number since it has no divisors other than 1 and 17. Each of these numbers fits the definition of a prime number firmly, while 1 does not.

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2

3

17

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