Mr. Bowen
4/17/2020 12:52:30 pm
Five is prime, but you are looking for a 3digit prime number.
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Mr. Bowen
4/17/2020 04:24:31 pm
What are the factors of 555? A prime number only has 2 factors.
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Haylee
4/17/2020 01:32:01 pm
555 is what I found
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Mr. Bowen
4/17/2020 04:23:57 pm
Remember, a prime number has exactly 2 factors, 1 and itself. Does 555 have any other factors?
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Mr. Bowen
4/20/2020 12:15:21 pm
You can check if a number is divisible by 3 by finding the sum of the digits (5 + 9 + 1 = 15) and then seeing if that sum is divisible by 3. Because 15 is divisible by 3, the entire number also has 3 as a factor. This means that 591 is composite.
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