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Examples of prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29……..

204 ÷ 2 = 102; 204 = 2 * 102

Now 102 is further divided by 2.

102 ÷ 2 = 51; 102 = 2 * 51.

Now 51 can be divided by the prime number 3.

51 = 3 * 17; 51 = 3 * 17.

Now the number 17 is a prime number which cannot be further divided by any other number other that one and itself.

Hence 204 = 2 *2 * 3 * 17.

220 ÷ 2 = 110; 220 = 2 * 110

Now 110 is further divided by 2.

110 ÷ 2 = 55; 110 = 2 * 55.

Now 55 can be divided by the prime number 5.

55 = 5* 11;

Now the number 11 is a prime number which cannot be further divided by any other number other that one and itself.

Hence 220 = 2 *2 * 5 * 11.