Also keep in mind that your calculator has limits. Real π is irrational but in a digital calculator it must be stored as a binary value in a chip, so it can’t have infinite precision, it’s not really π but a good-enough-for-most-uses approximation. The level of precision may vary from one calculator to another.

You can figure this out if you do π - 3, then multiply the answer by 10, subtract 1, multiply by 10, and so on subtracting the whole number value and moving the decimal point until you run out of digits. On my TI-36X π only has 12 digits: 3.14159265359