Sure, axis value formats are specified in data asignment. Select your numerical axis in data asignment mode and chose a pattern without decimals as depicted below.
To get even more readability you may skip some axis values using the skip values setting:
I tried both: the pattern in data assignment and Skip values setting. The result is same as on origin picture :(. If I change filter condition and the bar chart's x axis shows units from 0 to 4 (0 1 2 3 4) they are in expected "integer" format.