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No. 603 is divisible by 3. 603 divided by 3 is actually 201, making 603 a composite number.

(If the sum of all the digits in a number is divisible by 3, the number is divisible by 3. In this case, 6+0+3=9, and since 9 is divisible by 3 so is 603. )

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15y ago

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