Our house is in Nashville TN and unfortunately our basement was flooded during the rain. The water was seeping through the cinder block walls in our basement. I am not sure what mold looks like on cinder block and I am trying to find a way that I can prevent mold and mildew from taking over in my basement-is there any kind of home remedies I can use on the cinder block to kill mold and mildew?

Molds need a high humidity to grow. There are dessicant packages available to cut the humidity down. One brand is "Damp-Rid," there are others. As severe as the flooding was reported, you may want to invest in a dehumidifier.

Are the walls covered? If so you may need to strip that off and let it air a few months.

First off your home is not likely cinder block, cement block (CMU). Spray with a mildewcide but removing the moisture first is key to prevention. Mold spores are everywhere and will grow in only moist conditions