Is the pipa a Chinese musical instrument?

Yes.

The pipa, a traditional East Asian plucked instrument, has a history of more than 2,000 years. The earliest known instrument, the pipa, appeared in China around the time of the Qin Dynasty. It is a musical instrument that produces sound by playing the strings.

According to Fu Xuan's "Preface to the Pipa Fugue," the ancient laborers of China, while building the Great Wall, attached strings to the "rattle drum," a prop for dancing, and played it, creating a straight-handled, rounded soundbox with two skinned sides that was played vertically by hand, and which was called the "Qin Pipa" in later times. It was later called the "Qin pipa". This should be the earliest prototype of the pipa in China.

Expanded information:

The pipa, according to its development, can be divided into two kinds: one is a plucked instrument first appeared in China during the Qin Dynasty, created by the working people of our country, and because it is mostly a straight-necked pipa, we can refer to it as the "straight-necked pipa"; the other is a plucked instrument introduced into our country from the western regions, and we can refer to it as the "straight-necked pipa"; the other is a plucked instrument introduced into our country from the western regions. The other is a plucked instrument introduced to China from the Western region, which we can call the "curved-neck pipa" or "hu pipa".

Before the Tang Dynasty, pipa was also the generic name in Chinese for all plucked instruments of the lute family (also known as the lute genus). The Chinese pipa spread to other parts of East Asia, developing into the current Japanese pipa, Korean pipa and Vietnamese pipa.

Baidu Encyclopedia - Pipa