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Is 203 prime

Updated: 12/21/2022
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11y ago

Best Answer

No.

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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11y ago
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