No. 603 is divisible by 3. 603 divided by 3 is actually 201, making 603 a composite number.
(If the sum of all the digits in a number is divisible by 3, the number is divisible by 3. In this case, 6+0+3=9, and since 9 is divisible by 3 so is 603. )
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To determine if 603 is divisible by 6, we need to check if 603 divided by 6 results in a whole number without a remainder. When we divide 603 by 6, we get 100.5, which means there is a remainder of 0.5. Since there is a remainder, 603 is not divisible by 6.
603/25 = 603 ÷ 25 = 24.12
7 is a prime number!
109 is a prime number.
167 is a prime number.