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Express the number as a product of its factors.

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The factors of 16: 

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16 = 1 × 16.

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16 = 2 × 8.

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16 = 4 × 4.

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Factors of 16 are 1,2,4,8 and 16. Since the number has more than two factors,

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it is composite.\"\"

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The number 16 is a composite number.