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A number raised to the second power is a number times itself. This can also be stated as a number squared.
81 A number raised to the second power is the number multipled by itself twice (9*9). A number raised to the third power, is the number multipled by itself 3 times (9*9*9) and so on.
Any number raised to the second power means it is multiplied by itself two times. Thus 6 to the second power is: 6x6=136
It is raised to the second power
If a number raised to the second power is squared and raised to the third power is cubed, I'm going to take a guess and say that a number raised to the fourth power is tesseracted.