Is Xiashan No.7 Primary School a middle school directly under it?

Yes Because the school district of Xiashan 7 is the school district of No.2 Middle School, it was admitted according to the school district when the No.2 Middle School was admitted, so Xiashan 7 is directly connected with No.2 Middle School. Xiashan No.2 Middle School is a key middle school in Zhanjiang City, a first-class middle school in Guangdong Province, and a "national model ordinary high school" in Guangdong Province.