644 ÷ 4 = 161. So it simplifies to 2√161
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The square root of 20 is simplified as: ± 4.5
The square root of 212 simplified is: 14.6
The square root of 13 simplified is 3.6
The square root of 176 simplified is 13.3
The simplified square root of 530,000 is: ± 728