Factors, Prime and Composite Numbers

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What is a prime number?

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A prime number is a number greater than 1 that has exactly two factors: 1 and itself. For example, 2, 3, 5, and 7 are prime numbers.

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CCSS.4.OA.B.4

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What is a composite number?

Back

A composite number is a number that has more than two factors. For example, 4, 6, 8, and 9 are composite numbers.

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CCSS.4.OA.B.4

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What are factors?

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Factors are the numbers you multiply together to get another number. For example, the factors of 12 are 1, 2, 3, 4, 6, and 12.

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CCSS.4.OA.B.4

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Which of these numbers is a prime number: 15, 17, 21, 39?

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17 is a prime number.

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CCSS.4.OA.B.4

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Which of these numbers is a prime number: 10, 9, 7, 4?

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7 is a prime number.

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CCSS.4.OA.B.4

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How many factors does a prime number have?

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A prime number has exactly 2 factors.

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CCSS.4.OA.B.4

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How many factors does a composite number have?

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A composite number has more than 2 factors.

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CCSS.4.OA.B.4

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Is the number 1 a prime number?

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No, the number 1 is not a prime number because it has only one factor.

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CCSS.4.OA.B.4

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What is the smallest prime number?

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The smallest prime number is 2.

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CCSS.4.OA.B.4

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What is the largest single-digit prime number?

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The largest single-digit prime number is 7.

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CCSS.4.OA.B.4