No, but √-23 is. An imaginary number is the square root of a negative number.
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Yes. The number 1 + i is imaginary but not pure imaginary, while 5i is pure imaginary.
It is a pure imaginary number.Since (a+bi)-(a-bi) = 2bi, it is a pure imaginary number (it has no real component).
No. A complex number is a number that has both a real part and an imaginary part. Technically, a pure imaginary number ... which has no real part ... is not a complex number.
No, it is an imaginary number which is a complex number.
The imaginary unit number is the square root of -1 and is denoted by i