25 is divisible by 1, 5, 25
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No
Because it is devisible by 2
No, 1731 is devisible by 3.
Itself and one because 31 is a prime number
There are two things you have to ask. 1. Does it ends in a zero? If the answer is no then there is no need to move on to the next question. It is not devisible by 20 2. If you take off that zero then are you left with an even number? if the answer to both of these is yes then It is devisible by 20