Is 669 a prime number? What are the divisors of 669?

Parity of 669

669 is an odd number, because it is not evenly divisible by 2.

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Is 669 a perfect square number?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 669 is about 25.865.

Thus, the square root of 669 is not an integer, and therefore 669 is not a square number.

What is the square number of 669?

The square of a number (here 669) is the result of the product of this number (669) by itself (i.e., 669 × 669); the square of 669 is sometimes called "raising 669 to the power 2", or "669 squared".

The square of 669 is 447 561 because 669 × 669 = 6692 = 447 561.

As a consequence, 669 is the square root of 447 561.

Number of digits of 669

669 is a number with 3 digits.

What are the multiples of 669?

The multiples of 669 are all integers evenly divisible by 669, that is all numbers such that the remainder of the division by 669 is zero. There are infinitely many multiples of 669. The smallest multiples of 669 are:

How to determine whether an integer is a prime number?

To determine the primality of a number, several algorithms can be used. The most naive technique is to test all divisors strictly smaller to the number of which we want to determine the primality (here 669). First, we can eliminate all even numbers greater than 2 (and hence 4, 6, 8…). Then, we can stop this check when we reach the square root of the number of which we want to determine the primality (here the square root is about 25.865). Historically, the sieve of Eratosthenes (dating from the Greek mathematics) implements this technique in a relatively efficient manner.

More modern techniques include the sieve of Atkin, probabilistic algorithms, and the cyclotomic AKS test.

Numbers near 669

• Preceding numbers: …667, 668
• Following numbers: 670, 671

Nearest numbers from 669

• Preceding prime number: 661
• Following prime number: 673
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