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If we can find one factor, besides '1' and the number itself, then the number is not prime.
There may be more factors, but all we need is one in order to prove it 'not prime'.
Looking at '775', we notice that it ends in '5'. This tells us that it's a multiple of '5'; in other words,
'5' is a 'factor' of 775.
That's all it takes. 775 is composite, not prime.
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∙ 14y ago
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Prime number of 775?
775 is not a prime number, because 775 is divisible by 5. In fact, the prime divisors of 775 are 5, 5, and 31.
What is the prime number 775 as a power?
775 is NOT a prime number.775 = 5^2*31.
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