PRIME NUMBERS

FOR COMPUTING A PRIME NUMBER
TAKE SQUARE ROOT OF IT AND CHECK THAT IT IS DIVISIBLE BY PRIME NUMBERS LESS THAN ITS SQUARE ROOT OR NOT
IF NOT THEN THE NUMBER IS PRIME NUMBER

2 IS ALSO A PRIME NUMBER LESS THAN \sqrt{28}

thats infact eratosthenes method
guys who are preparing for olympiads will be well versed with it

YEAH ,IT IS NAME OF THIS METHOD
MY MATH SIR TOLD ME THIS METHOD...

DO U KNOW
12+3 - 4+5+67+8+9=100

DO U KNOW PIE AND e CAN BE CALCULATED
(USE EXPANSIONS OF INVERSE FUNCTIONS)