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No, it is an imaginary number (a special case of a complex number). The factor multiplying i can be written down as a ratio of two integers: 2/1. The word ratio comes from rational.

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Related Questions

Is the square root of negative 4 irrational?

No, but it is imaginary: 2i.


The conjugate of the complex number 3 plus 2i is?

It is 3 minus 2i


What is the imaginary number of square root of -4?

Either 2i or -2i, when squared equal -4.


What is conjugation of 7-2i?

The conjugate of a complex number can be found by multiplying the imaginary part by -1, then adding the "real" part back. (-2i) * -1 = 2i, so the conjugation is 7+2i


What is the sum of an rational number and irrational number?

An irrational number.


Is an irrational number plus an irrational number rational?

No. The sum of an irrational number and any other [real] number is irrational.


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The sum of a rational and irrational number must be an irrational number.


Is the square root of -4 irrational?

The square root of -4 is not irrational, it is imaginary. Irrational numbers are numbers that cannot be expressed as a fraction, like the square root of 2. Irrational numbers, however, are a subset of real numbers. The square root of -4 however, is not even a real number because no real number, when squared, gives -4. Therefore the square root of -4 is an imaginary number.In calculus, the root is expressed as 2i where iis the square root of -1.


Is 3.56 an irrational number?

No, 3.56 is not an irrational number. 3.56 is rational.


Whether a rational number multiplied by an irrational number gives an irrational number?

rational * irrational = irrational.


Is negative pi rational or irrational?

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At least one of the factors has to be irrational.* An irrational number times ANY number (except zero) is irrational. * The product of two irrational numbers can be either rational or irrational.