Is 780 a prime number? What are the divisors of 780?

## Parity of 780

780 is an even number, because it is evenly divisible by 2: 780 / 2 = 390.

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## Is 780 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 780 is about 27.928.

Thus, the square root of 780 is not an integer, and therefore 780 is not a square number.

## What is the square number of 780?

The square of a number (here 780) is the result of the product of this number (780) by itself (i.e., 780 × 780); the square of 780 is sometimes called "raising 780 to the power 2", or "780 squared".

The square of 780 is 608 400 because 780 × 780 = 7802 = 608 400.

As a consequence, 780 is the square root of 608 400.

## Number of digits of 780

780 is a number with 3 digits.

## What are the multiples of 780?

The multiples of 780 are all integers evenly divisible by 780, that is all numbers such that the remainder of the division by 780 is zero. There are infinitely many multiples of 780. The smallest multiples of 780 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 780). 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 27.928). 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 780

• Preceding numbers: …778, 779
• Following numbers: 781, 782

### Nearest numbers from 780

• Preceding prime number: 773
• Following prime number: 787
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