To find out if 7 is a factor of 2395, divide 7 into 2395 and you'll get 342 and a remainder of 1. This means 7 is not a factor of 2395.
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If the prime factorization contains a 5 and a 7, 35 is a factor.
You must have at least two whole numbers to determine a greatest common factor.
Since 81 is not divisible by 7 therefore, 7 is not a factor of 81.
Divide 7 into 291. If it comes out evenly, it's a factor. It doesn't, so it's not.
The GCF of 7, 21, and 42 is 7, because 7 is a factor of all three.