From the question it is given that,
Total number of students were sitting in a lecture room = 8649
Let us assume number of students in each row be ‘a’
Then,
Total number of students = a × a
8649 = a2
By taking square root on both side,
a = √(8649)
a = √(93 × 93)
a = √(93)2
a = 93
∴The number of students in each row is 93.