On the one hand, most suicides are not very familiar with the body structure, so they often see exploratory injuries. In addition, many suicides are hesitant and contradictory. Those who are not really cruel and have no nostalgia for the world will stop as soon as the knife is cut. But then I wanted to die before I cut it. It is normal for such a suicide to have multiple stab wounds.
On the other hand, because of vendetta or warning, revenge and other reasons, there may be homicide, and the victim will be injured with a knife many times. These are all carried out by others, and the strength, angle and position are different from suicide.
To sum up, these can only be known after the forensic doctor records the autopsy. You can't just judge by the number of knife wounds.