Is 778 a prime number? What are the divisors of 778?

## Parity of 778

778 is an even number, because it is evenly divisible by 2: 778 / 2 = 389.

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## Is 778 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 778 is about 27.893.

Thus, the square root of 778 is not an integer, and therefore 778 is not a square number.

## What is the square number of 778?

The square of a number (here 778) is the result of the product of this number (778) by itself (i.e., 778 × 778); the square of 778 is sometimes called "raising 778 to the power 2", or "778 squared".

The square of 778 is 605 284 because 778 × 778 = 7782 = 605 284.

As a consequence, 778 is the square root of 605 284.

## Number of digits of 778

778 is a number with 3 digits.

## What are the multiples of 778?

The multiples of 778 are all integers evenly divisible by 778, that is all numbers such that the remainder of the division by 778 is zero. There are infinitely many multiples of 778. The smallest multiples of 778 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 778). 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 27.893). 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 778

• Preceding numbers: …776, 777
• Following numbers: 779, 780

### Nearest numbers from 778

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