Is pie a real number? Yes, Pi is a real number because any number can be expressed in the form of (a+ib) where a is the real part and b is an imaginary part. When b=0, the number consists of only real parts(a) and is a real number whereas when a=0, it consists of only imaginary parts(ib) and when a and b both are none zero numbers they are called complex numbers.What is the exact number of pie? The number Pi, denoted by the Greek letter π - pronounced 'pie', is one of the most common constants in all of mathematics. It is the circumference of any circle, pided by its diameter. Nobody knows its exact value, because no matter how many digits you calculate it to, the number never ends. For most practical uses, you can assume it is 3.142.Why is pie an irrational number? pie is an irrational number. pie is the ratio of the circumference and diameter of a circle. when we measure the circumference and diameter of the cirle, the ratio is 22/7. but is is not the exact value, because there is no instrument to measure the exact value of circumference of the circle.What number is pie equal to? The number Pi, symbolized by a Greek letter, has a constant value that approximately equals 3.14159. Pi is an irrational number, which means it cannot be expressed as a common fraction, and it has an infinite decimal representation without any repeating pattern. Pi, by definition, is the ratio of a circle’s circumference to its diameter (Pi = C/d).