It's not as clear cut as that. It's just down to the wording of your claims as to whether your invention is software or not. The question that needs to be asked

It's not as clear cut as that. It's just down to the wording of your claims as to whether your invention is software or not. The question that needs to be asked is whether the claimed invention involves the production of some commercially useful effect. If so, then even if it's using software to achieve that, it will be patentable.