The number I've seen for their total testing was 290,000.
"At first, Seegene struggled to meet demand, but now it is coping. The firm is making about 10,000 kits a week and each kit can test 100 patients. So it is making enough to test one million patients each week, at a cost of under $20 per test. "
https://www.cnn.com/2020/03/12/asia/coronavirus-south-korea-testing-intl-hnk/index.html