Question

by what least number should 2156 the given number be multiplied to get a perfect square number find the number whose square is the new number

Answer 1

First, we find the prime factor of 2156, 2156=2×2×7×7×11, grouping the factor into pair 11 is left, so 11 is the least number should be multiplied. The new number 23716 is square of 154