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The square root of 2 is

1.4142135623730950488016887242096980785696718753769480731766797379907324784621

Ans. 2 The square root of 2 is irrational; that means that it can not be expressed by a fraction,. Any decimal that terminates or repeats is a fraction; this means that an attempt to express root 2 by a decimal can never be exact.

For most everyday purposes people use 1.414 when they need an approximation. The decimal given above is a much closer approximation, but still not exact.

Note. The qn says what is sqrt-2 ?. Both answerers have assumed that the questioner meant sqrt(2), or 21/2.

If the qn really was "what is ( -2) 1/2 ", everything above should be multiplied by i. i is the square root of -1, a so-called imaginary number.

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