The same number is multiplied with itself to form a perfect square i.e. a perfect square has real and repeated equal numbers as factors.
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Pairs of numbers.
319 = 29 x 11. No perfect square factors, so sqrt(319).
A trinomial is perfect square if it can be factored into the form
√155 is. 155 has no factors that are perfect squares, so there's no way to simplify it.
It is the same as 10 times the square root of 7