SOLUTION: find the smallest integer of k such that 2520k is a perfect square. (can you provide answer with working)

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Question 398295: find the smallest integer of k such that 2520k is a perfect square.
(can you provide answer with working)
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
2520k+=+2%5E3%2A3%5E2%2A5%2A7%2Ak. Then by inspection the least value of k is 2*5*7 = 70.