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Since the sum if its digits (1 + 7 + 7 = 15) is divisible by 3, the original number 177 is divisible by 3.
Now we know that it has at least one factor in addition to '1' and itself, so it's not prime.
Wiki User
∙ 14y ago
Nickea Sikes
Wiki User
∙ 14y agoWiki User
∙ 7y agocomposite
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