No it is a rational number because it stops.
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Yes. The number 1 + i is imaginary but not pure imaginary, while 5i is pure imaginary.
314 + 809 = 1123
It is a pure imaginary number.Since (a+bi)-(a-bi) = 2bi, it is a pure imaginary number (it has no real component).
The number 314 would be represented in Roman numerals as CCCXIV.
No, but √-23 is. An imaginary number is the square root of a negative number.