Yes, Qian Long died on February 7, 1799
No, Qian Long is not single.
Qian Xuan died in 1305.
Qian Chu died in 988.
Qian Qi died in 782.
Qian Du died in 1844.
Qian Sanqiang died in 1992.
Yu Qian died in 1457.
Cai Qian died in 1809.
Qian Xinzhong died in 2009.
Fu Qian died in 263.
Qian Xuantong died in 1939.
Qian Shizhen died in 1642.