What is the least number by which 2940 must be multiplied to get a perfect square

Answers (1)

By prime factorization method

2940 = (2x2)x3x5x(7x7)

If prime factors of a number are grouped in doubles of equal factors, then it is a perfect square.

Hence the least number 15(3x5) shuold be multiplied to get the perfect square. 

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