RRB Group D (Level-1 posts) 2022 · Question 393 of 598
Prime factorization of 6300 = 2² × 3² × 5² × 7. To make it a perfect square, we need another 7, so multiplying by 7 makes it a perfect square.
Source: RRB Group D 2022 Prev. Yr. Paper (18 Aug 2022) (Shift 2) - Prepp · reliable-secondary
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