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The way to know the Prime Numbers is to find out if they can only Multiplied Once ,The way to know Composite Numbers is to find out if they can be Multiplied Twice
The same way as with smaller numbers, it may take longer. Just keep dividing by prime numbers until all the factors are prime.
'25' is odd, all right, but not prime. (It can be divided by 1, 5, and 25) By the way, prime numbers must be odd numbers. All even numbers can be divided by 2, at least, and are therefore not prime.
There is no simple way. The difficulty wit prime numbers is that there is no pattern.
study hard