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The best way to answer this question is to first find the square root of 203. which is about 14.2. Now try dividing by each of the prime numbers from 2 to 14.

This means 2, 3, 5, 7, 11 and 13. There are short cuts to test divisibility by 2, 3, and 5.:

- An even number is divisible by 2.

- Add the digits of the number. If the sum is divisible by 3, then the number is divisible by 3.

- a number ending in 5 (or 0) is divisible by 5.

203 fails these tests, so we just need to try 7 and 11.

203/7 = 29, so 203 = 7 x 29 and is not prime.

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12y ago

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