using prime factorization find 284 is a perfect sqaure
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What is the last number of 284? It is this number: 284. The answer is 4. ...
2 + 8 + 4 = 14. If the answer is more than one digit, you would add each digit of the answer together again: 1 + 4 = 5. ...
So now we know the digital root of 284 is 5.
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