The short answer to your question is yes, 36.9°C (98.4°F) is considered a fever in the context of the novel coronavirus (COVID-19). According to the World Health Organization (WHO), a fever is defined as a body temperature higher than 37.3°C (99.1°F).
In the context of COVID-19, a fever is indicative of an infection and should be taken seriously, as it is one of the main symptoms of the virus. In some cases, fever can reach temperatures of up to 40°C (104°F) or higher, and should be monitored closely. Other symptoms of COVID-19 include a dry cough, difficulty breathing, tiredness, and aches and pains.
It is important to remember that a fever is just one symptom of COVID-19, and is not definitive proof of an infection. If you have a fever and any other symptoms of the virus, it is important to contact a medical professional to get tested and get the appropriate treatment. If you have been in contact with someone who has tested positive for COVID-19, it is important to self-isolate and contact your local health authority for further guidance.
In conclusion, 36.9°C (98.4°F) is considered a fever in the context of COVID-19, and should be taken seriously if accompanied by other symptoms associated with the virus. It is important to contact a medical professional and take the necessary precautions to protect yourself and those around you.