Is negligence an intentional tort

No. Put simply, the tort of negligence arises when somebody (1) has a duty of care towards others, (2) breaches that duty by engaging in conduct which falls below the relevant standard of care and (3) causes harm to another person (technically, causation and damages are analyzed separately, but I'm trying to keep this simple).

All that's required for negligence is carelessness. Whether or not the tortfeasor intended to cause harm to anybody is totally irrelevant.