From Wikipedia: "As of January 2010, the record is almost 2.7 trillion digits."
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The fraction 22/7 is close to PI for four significant digits.
Pi has over two billion digits but you can use 3.14 or if you need a fraction 22/7
I'm taking that to mean the earliest string of 7 digits in pi which are a prime number. There's one just three decimal places in: 3.141592653, and it actually overlaps with the next one, 6535897.
It is used in whole world.7 digits.1K=103 1,000 -------->4 digits.1M=106 1,000,000. ------>7 digits.
pi is a universal constant. It is a transcendental number which is a special kind of irrational number. It cannot be expressed as a terminating or repeating decimal, nor as a ratio of integers or surds. There are various ways in which pi can be calculated and expressed. Commonly used approximations are 22/7, 3.14, 3.14159. Last year pi was calculated to 5 trillion digits although 40 digits are thought to be sufficient to calculate the angle subtended on earth by a hydrogen atom at the far end of the known universe!