Is 356 a prime number?

It is possible to find out using mathematical methods whether a given integer is a prime number or not.

For 356, the answer is: No, 356 is not a prime number.

The list of all positive divisors (i.e., the list of all integers that divide 356) is as follows: 1, 2, 4, 89, 178, 356.

For 356 to be a prime number, it would have been required that 356 has only two divisors, i.e., itself and 1.

Find out more:

What is a prime number?

As a consequence:

356 is a multiple of 1
356 is a multiple of 2
356 is a multiple of 4
356 is a multiple of 89
356 is a multiple of 178

For 356 to be a prime number, it would have been required that 356 has only two divisors, i.e., itself and 1.

Is 356 a deficient number?

Yes, 356 is a deficient number, that is to say 356 is a natural number that is strictly larger than the sum of its proper divisors, i.e., the divisors of 356 without 356 itself (that is 1 + 2 + 4 + 89 + 178 = 274).

Parity of 356

356 is an even number, because it is evenly divisible by 2: 356 / 2 = 178.

Find out more:

What is an even number?

Is 356 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 356 is about 18.868.

Thus, the square root of 356 is not an integer, and therefore 356 is not a square number.

What is the square number of 356?

The square of a number (here 356) is the result of the product of this number (356) by itself (i.e., 356 × 356); the square of 356 is sometimes called "raising 356 to the power 2", or "356 squared".

The square of 356 is 126 736 because 356 × 356 = 356² = 126 736.

As a consequence, 356 is the square root of 126 736.

Number of digits of 356

356 is a number with 3 digits.

What are the multiples of 356?

The multiples of 356 are all integers evenly divisible by 356, that is all numbers such that the remainder of the division by 356 is zero. There are infinitely many multiples of 356. The smallest multiples of 356 are:

0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 356 too, since 0 × 356 = 0
356: indeed, 356 is a multiple of itself, since 356 is evenly divisible by 356 (we have 356 / 356 = 1, so the remainder of this division is indeed zero)
712: indeed, 712 = 356 × 2
1 068: indeed, 1 068 = 356 × 3
1 424: indeed, 1 424 = 356 × 4
1 780: indeed, 1 780 = 356 × 5
etc.

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 356). 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 18.868). 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 356

Preceding numbers: …354, 355
Following numbers: 357, 358…

Nearest numbers from 356

Preceding prime number: 353
Following prime number: 359