Divide 7 into 291. If it comes out evenly, it's a factor. It doesn't, so it's not.
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Divide your number by 7 and see if there is a remainder. If there is a remainder, 7 is not a factor.
None. 291 is not divisible by 7 and so you cant have a whole number factor pair with 7
No.
Since 81 is not divisible by 7 therefore, 7 is not a factor of 81.
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.
The GCF of 7, 21, and 42 is 7, because 7 is a factor of all three.