The second square number is 4 because \(2 \times 2 = 4\)
The first square number is 1 because \(1 \times 1 = 1\). It is called a square number because it gives the area of a square whose side length is an integer. Square NumbersĪ square number is the answer when an integer is multiplied by itself. Identify the prime number from this list: 42, 43, 44, 45Ĥ2 and 44 are even, and so cannot be prime as they both have 2 as a factor.Ĥ3 is prime as the only factors of 43 are 1 and 43. There are an infinite number of prime numbers. Every other even number has 2 as a factor, and so will not be prime. 15 has more than 2 factors, so it is not a prime.ġ is not a prime number as it only has one factor - itself.Ģ is the only even prime number. No other whole numbers can multiply together to make 11.ġ5 is not a prime number because the factors of 15 are 1, 3, 5 and 15 ( \(1 \times 15 = 15, 3 \times 5 = 15\) ). Another way to think of prime numbers is that they are only ever found as answers in their own times tables.ġ1 is a prime number because the only factors of 11 are 1 and 11 ( \(1 \times 11 = 11\) ). A prime number is only divisible by 1 and itself.
Prime, Square and Cube Numbers Prime numbersĪ prime number is a number with exactly two factors.
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