Fundamental Theorem Of Arithmetic

 

Any integer greater than 1 is either a prime number, or can be written as a unique product of prime numbers.

Similarly, we can continue writing ,

10 is 2×5

11 is Prime,

12 is 2×2×3

13 is Prime

14 is 2×7

15 is 3×5

16 is 2×2×2×2

17 is Prime

 

So they are either prime, or primes multiplied together

Example:

Make 42 by multiplying only prime numbers?

2 × 3 × 7 = 42

Yes, 2, 3 and 7 are prime numbers, and when multiplied together they make 42.