19 x 19 = 361
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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.
9
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.