गणित समस्या हल करें

चरण दर चरण

1. \sqrt{561} \approx 23

   Only primes up to √561 need testing: any factor above it pairs with one below.

2. 561 \bmod 2 = 1

   2 does not divide 561.

3. 561 = 3 \times 187

   3 divides 561, so 561 is composite.

जवाब दिखाएँ

\text{561 is not prime}