Well we have: 2,3,5,7,11,13,17,19,23,29. It really helps if you have the multiplication tables (to 12x12 for sure) memorized rock-solid. That way you can just look at a number (up to probably 60 or so) and just 'know' if it has any factors.
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Any prime number to the tenth power like 1024 or 59049.
You is called a prime number!You is called a prime number!You is called a prime number!You is called a prime number!
172.8
A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.
101 is a prime number. The only factor of 101 is itself and 1.prime