In my shapefile, I have a bunch of features and one field is a integer numerical attribute. I'd like to select all of the features whose value is a multiple of another value. For instance, I have a field with typical values of 100, 101, 102, 103, 104, 105, 106, etc. (up to 1000) and I would like to select all features with a value that is a multiple of 5.
If your tool supports it, use the modulo operator.
... all features with a value that divides by five without a remainder.