You can do this by finding the prime factors of 2352
2352 = 2 * 2* 2 * 2 * 3 * 7 * 7
We see that its not a perfect square because there is only one 3. If we multiply by another 3 we will have a perfect square.
2*2*2*2*3*3*7*7 = 7056 which is the smallest perfect square as required.
square root of 7056 = 2 *2 * 3 * 7 = 84 answer