1. Prime numbers

2. Prime Number has only 2 factors.
Numbers that are divisible only by “ 1” and by that number itself are called prime numbers.
Prime Number has only 2 factors.
Number
Divisible by
No of
factors
6 has more than 2 factors.
So it is Not a Prime number 6
1 , 2 ,3 , 6 4
5 only 2 factors.
So it is a Prime number 5
1 , 5 2
10 has more than 2 factors.
So it is Not a Prime number 10
1, 2, 5, 10 4
13 only 2 factors.
So it is a Prime number 13
& 13 2

3. Facts Prime number must be divisible exactly by 2 numbers
“1” – it is divisible only by 1. It is not a prime number ( prime numbers to be divisible by 2 numbers)
“2” – is the smallest prime number – divisible by 1 & 2

4. Facts There are 25 prime numbers between 1 and 100.
2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31 , 37 , 41, , 47 , 53 , 59 , 61 , 67 , 71 , 73 , 79 , 83 , 89 , 97

5. Try these Find prime numbers between 5 and 15
From the given number below list the prime number
9 , 3 , 23 , 18 , 17 , 15 , 27
3. From the given number below list the prime number
25 , 13 , 27 , 19 , 29 , 17 , 26