Ontario Mathematics Proficiency Practice Test

Question: 1 / 400

What is an example of a prime number?

4

9

11

A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself. In this context, 11 fits the definition of a prime number because its only divisors are 1 and 11. This means there are no other numbers that can divide 11 evenly without leaving a remainder.

On the other hand, the other numbers listed either have more than two divisors or are not considered prime. For example, 4 can be divided evenly by 1, 2, and 4; 9 has divisors of 1, 3, and 9; and 15 can be divided by 1, 3, 5, and 15. Since these numbers can be evenly divided by numbers other than just 1 and themselves, they do not qualify as prime.

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