🧠 Grade 4 Math Quiz · Number Theory

Prime Numbers Practice Questions

68 Grade 4 questions on Prime Numbers. Choose an answer to get instant feedback and a short explanation — the first 10 are free.

Which number is a prime number?

Explanation: 11 has only two factors: 1 and 11.

A prime number has exactly how many factors?

Explanation: Exactly two factors: 1 and itself.

Which of these is the smallest prime number?

Explanation: 2 is the smallest prime number and the only even prime.

Is 17 a prime number?

Explanation: 17 has only factors 1 and 17.

Which number is NOT a prime?

Explanation: 21 = 3 × 7, so it is composite.

How many prime numbers are there between 1 and 10?

Explanation: 2, 3, 5, 7 (four primes).

The only even prime number is:

Explanation: 2 is the only even prime number.

Which of these numbers is prime?

Explanation: 29 has only factors 1 and 29.

A composite number has how many factors?

Explanation: More than two factors.

Is 23 a prime number?

Explanation: 23 has only two factors: 1 and 23.

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