Is 35 a prime number?

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

For 35, the answer is: No, 35 is not a prime number.

The list of all positive divisors (i.e., the list of all integers that divide 35) is as follows: 1, 5, 7, 35.

For 35 to be a prime number, it would have been required that 35 has only two divisors, i.e., itself and 1.

Find out more:

What is a prime number?

Actually, one can immediately see that 35 cannot be prime, because 5 is one of its divisors: indeed, a number ending with 0 or 5 has necessarily 5 among its divisors. The last digit of 35 is 5, so it is divisible by 5 and is therefore not prime.

As a consequence:

35 is a multiple of 1
35 is a multiple of 5
35 is a multiple of 7

For 35 to be a prime number, it would have been required that 35 has only two divisors, i.e., itself and 1.

However, 35 is a semiprime (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 35 = 5 x 7, where 5 and 7 are both prime numbers.

Is 35 a deficient number?

Yes, 35 is a deficient number, that is to say 35 is a natural number that is strictly larger than the sum of its proper divisors, i.e., the divisors of 35 without 35 itself (that is 1 + 5 + 7 = 13).

Parity of 35

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

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What is an even number?

Is 35 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 35 is about 5.916.

Thus, the square root of 35 is not an integer, and therefore 35 is not a square number.

What is the square number of 35?

The square of a number (here 35) is the result of the product of this number (35) by itself (i.e., 35 × 35); the square of 35 is sometimes called "raising 35 to the power 2", or "35 squared".

The square of 35 is 1 225 because 35 × 35 = 35² = 1 225.

As a consequence, 35 is the square root of 1 225.

Number of digits of 35

35 is a number with 2 digits.

What are the multiples of 35?

The multiples of 35 are all integers evenly divisible by 35, that is all numbers such that the remainder of the division by 35 is zero. There are infinitely many multiples of 35. The smallest multiples of 35 are:

0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 35 too, since 0 × 35 = 0
35: indeed, 35 is a multiple of itself, since 35 is evenly divisible by 35 (we have 35 / 35 = 1, so the remainder of this division is indeed zero)
70: indeed, 70 = 35 × 2
105: indeed, 105 = 35 × 3
140: indeed, 140 = 35 × 4
175: indeed, 175 = 35 × 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 35). 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 5.916). 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 35

Preceding numbers: …33, 34
Following numbers: 36, 37…

Nearest numbers from 35

Preceding prime number: 31
Following prime number: 37