squares and cubes of prime numbers
Answers
Prime numbers
A prime number is a number with exactly two factors. A prime number is only divisible by 1 and itself. Another way to think of prime numbers is that they are only ever found as answers in their own times tables.
11 is a prime number because the only factors of 11 are 1 and 11. No other whole numbers can multiply together to make 11.
15 is not a prime number because the factors of 15 are 1, 3, 5 and 15 . 15 has more than 2 factors, so it is not a prime.
1 is not a prime number as it only has one factor - itself.
2 is the only even prime number. Every other even number has 2 as a factor, and so will not be prime.
There are an infinite number of prime numbers. The prime numbers under 30 are: 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.
Example
Identify the prime number from this list: 42, 43, 44, 45
42 and 44 are even, and so cannot be prime as they both have 2 as a factor.
and so is not prime.
43 is prime as the only factors of 43 are 1 and 43.
Square Numbers
A square number is the answer when an integer is multiplied by itself. It is called a square number because it gives the area of a square whose side length is an integer.
The first square number is 1 because
The second square number is 4 because
The third square number is 9 because and so on.
The first fifteen square numbers are: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196 and 225.
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Example
What is the twentieth square number?
20 squared
So 400 is the twentieth square number.