I'll give you a question, please answer with step-by-step reasoning process.
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be\nOptions:\n(A) 2\n(B) 5\n(C) 6\n(D) 7\n(E) 14

(E)
3150*y = A^2\n3 * 1050 * y = A^2\n3*5*210*y = A^2\n3*5*7*3*2*5*y = A^2\n2*3^2*5^2*7*y = A^2\nConcept: The factors of squared integer should occur in pair.

So, the only numbers left are 2*7\nHence 14 ;.

So, the answer is (E)