YES
Any rational number taken to any integer power is still rational.
Now if you meant to refer to the irrational number Pi - which is approximately 3.14159..., then squaring it does not make it rational.
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2.6666...repeating is a rational number because it can be expressed as a fraction in the form of 8/3
2a to the second power. If you combine the like terms, (a to the second power + a to the second power), it would be the same as 2a to the second power.
1 x 314 and 2 x 157
sqrt(314) cannot be simplified.
8x to the second power is 64x2