Yes, quadrillion is a real number. In fact, it is a term used to describe a very large quantity. In the short scale, which is commonly used in the United States and most English-speaking countries, a quadrillion is equal to 1,000 trillion or 1015. This means it is a 1 followed by 15 zeros: 1,000,000,000,000,000.
The term ‘quadrillion’ is often used in contexts involving finance, science, and data measurement, where such large numbers become necessary. For instance, you might hear about national debts or the number of stars in a galaxy being expressed in quadrillions.
In summary, quadrillion is not only a real number, but it also plays a significant role in various fields that require the representation of large values.