Yes for example 42 = 16 and 4/16 = 1/4 or 0.25
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A number that is divisible by 4.
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You try if the number is divisible by any smaller number (except one). If it isn't, it is a prime number. In practice, it is enough to test divisibility by factors up to the square root of the number.You try if the number is divisible by any smaller number (except one). If it isn't, it is a prime number. In practice, it is enough to test divisibility by factors up to the square root of the number.You try if the number is divisible by any smaller number (except one). If it isn't, it is a prime number. In practice, it is enough to test divisibility by factors up to the square root of the number.You try if the number is divisible by any smaller number (except one). If it isn't, it is a prime number. In practice, it is enough to test divisibility by factors up to the square root of the number.
No. A prime number is divisible only by itself and 1. Squares have other factors.
No, 7 * 7 + 1 = 50, which is divisible by 2 and 5.