I have a bump on my tongue and it doesn't hurt could this be mouth cancer?

See your doctor. You should see your doctor and get it checked. You probably need to see an oral surgeon if the bump looks suspicious for a biopsy. Cancerous lesion usually painless.
Possible. See your physician, cancer of tongue may appear as a painless mass.
Needs examination. Without physical examination of the "bump" it is not possible to say. The lesion needs to be examined and if suspicious shold be biopsied so the that the tissue may be examined by a pathologist to be certain of the diagnosis.
Signs/Symptoms. See oral surgeon or ENT doc if you have any of these symptoms: Persistent mouth sore, persistent mouth pain, a lump or thickening in the cheek, a white/red patch on the gums, tongue, tonsil, or lining of the mouth, a sore throat, hoarseness or feeling that something is caught in the throat that does not go away, difficulty swallowing/chewing.