Find the greatest number of six digit which is a perfect square.

A "perfect square" is an integer that is the square of an integer.The largest 6-digit integer is 999,999.The square root of it is 999.9995So the greatest square of an integer is the square of 999 = 998,001 .

From the ques, it can be said that the answer would be less than 1000000Start from 999,999*999= 998001Therefore, 998001 is a greatest number of square 999.