By definition, a Prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
All prime numbers less than 50 have exactly two factors. e.g. 2,3,5,7,11,13,17,19,23,29,31,37,41,43 & 47.
The squares of all prime numbers less than 10.The squares of all prime numbers less than 10.The squares of all prime numbers less than 10.The squares of all prime numbers less than 10.
4, 9, 25, 49 Squares of prime numbers.
4, 9, 25 and 49 They are squares of prime numbers.
Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.
4, 9, 25, and 49
Nothing special. They are squares of prime numbers.
prime squares 4, 9, 25, 49
Numbers can be checked to see if they are primes simply by factoring them. Every prime number has exactly two factors, 1 and the number itself. If there are more or less than 2 factors, the number is not a prime. 1 has only one factor so it is not a prime, and composite numbers have 3 or more factors.
Composite numbers have more than two factors. So, the numbers which have two or less than two factors are not composite numbers. Numbers which have exactly two factors are prime numbers. 1 is an exceptional case because it is neither prime nor composite since it has only one factor which is 1.
Prime squares, like 4, 9, 25 and 49.
Prime numbers