Kaplan Nursing Entrance Practice Exam 2025 – The All-in-One Guide to Exam Success!

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What is a prime number?

31

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 (without leaving a remainder) by 1 and the number itself.

In the case of the first option, 31 is a prime number because it can only be divided by 1 and 31 without resulting in a fraction or remainder.

Looking at the other numbers: 30 has divisors such as 1, 2, 3, 5, 6, 10, 15, and 30; thus, it is not a prime number. Likewise, 28 can be divided evenly by 1, 2, 4, 7, 14, and 28, confirming it as non-prime. Similarly, 25 can be evenly divided by 1, 5, and 25, showing that it too does not meet the criteria for being a prime number.

This understanding of prime numbers is fundamental in mathematics and is particularly important in various applications such as cryptography and number theory.

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