Get out calculator and divide the number by seven. If you can use a computer, use the calculator on your computer.
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No, 7 is a natural number divisible by 7 and not 14 for example. In fact every odd multiple of 7 (i.e. 7 times 1,3,5,7,...) is divisible by 7 and not 14.
Every number is divisible by any non-zero number. No, there are an infinite number of odd integers which are not evenly divisible by 7..
There are 22 such numbers.
If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7.
The smallest number that is divisible by 5, 6, and 7 is 210.