<human>:  In the book, ‘The Man Who Knew Infinity’, what is the name of the character who is the main protagonist?
<bot>: The main protagonist is the mathematician Srinivasa Ramanujan. He was born in India in 1887 and was a self-taught mathematician. He died in 1920 at the age of 32. His work on infinite series and continued fractions led to his discovery of the infinite number of primes. He also discovered the distribution of primes in arithmetic progressions.