Not praying salaah except during Ramadaan

Assalaam alaikum,

I have heard a scholar saying that if a person abandons namaaz or salah he or she is a Kafir. He also said that if a person only prays during the month of Ramadaan but does not pray the rest of the year, he or she will be considered a kafir. My question is that we see many Muslims who only pray during Ramadaan, but do not pray after Ramadaan for the rest of the year. So are they considered Kafir?

JazakAllah