It was much greater than that.rohit research and during his live with arpit he mention that 7 million people died in kurukshetra war😲 and he also mention about bramhastra being released not sure though becos the network was not clear from their side
The royal sage Dhritarashtra, however, restraining the grief that arises from folly, enquired of Yudhishthira the just, saying, ‘If, O son of Pandu, thou knowest it, tell me the number of those that have fallen in this battle, as also of those that have escaped with life!’
"Yudhishthira answered, ‘One billion 660 million and 20,000 men have fallen in this battle. Of the heroes that have escaped, the number is 240,165.
The Mahabharata
Book 11: Stri Parva
Kisari Mohan Ganguli, tr.
[1883-1896]