Elsewhere, four attacks in and around Baghdad killed at least seven people, bringing the day's overall death toll to at least 16.
Those attacks, mostly by bombs that went off in commercial areas or targeted security forces, also wounded at least 20 people, police and medical officials said.
In the Baghdad attack, the car was parked near an outdoor fruit and vegetable market in a mostly Shiite neighborhood of the city.
No one immediately claimed responsibility for the attacks but they bore the hallmarks of IS, which has carried out a string of bombings in Baghdad over the past week, killing nearly 100 people.
More From This Section
The Sunni extremists frequently target Iraq's security forces and civilians in Shiite neighborhoods.
IS has managed to carry out a series of attacks across Iraq while also putting up stiff resistance in the northern city of Mosul, where US-backed Iraqi forces have been waging a massive offensive since mid-October to retake the city, Iraq's second-largest, from the militants.
Iraqi forces have retaken around a quarter of the city since the offensive began.
Iraq announced a new operation today to recapture IS-held towns near the Syrian border.
Major General Qassim al-Mohammadi said the troops would try to dislodge IS from Rawah, Anah and Qaim, towns in the western Anbar province that fell to the extremists in the summer of 2014.
US-backed Iraqi forces drove IS from the two main cities of Anbar, Ramadi and Fallujah, last year.