Is 1391 a prime number?

1 391 is an odd number, because it is not evenly divisible by 2.

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• What is an even 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 1 391 is about 37.296.

Thus, the square root of 1 391 is not an integer, and therefore 1 391 is not a square number.

The square of a number (here 1 391) is the result of the product of this number (1 391) by itself (i.e., 1 391 × 1 391); the square of 1 391 is sometimes called "raising 1 391 to the power 2", or "1 391 squared".

The square of 1 391 is 1 934 881 because 1 391 × 1 391 = 1 391² = 1 934 881.

As a consequence, 1 391 is the square root of 1 934 881.

1 391 is a number with 4 digits.

The multiples of 1 391 are all integers evenly divisible by 1 391, that is all numbers such that the remainder of the division by 1 391 is zero. There are infinitely many multiples of 1 391. The smallest multiples of 1 391 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 1 391 too, since 0 × 1 391 = 0
• 1 391: indeed, 1 391 is a multiple of itself, since 1 391 is evenly divisible by 1 391 (we have 1 391 / 1 391 = 1, so the remainder of this division is indeed zero)
• 2 782: indeed, 2 782 = 1 391 × 2
• 4 173: indeed, 4 173 = 1 391 × 3
• 5 564: indeed, 5 564 = 1 391 × 4
• 6 955: indeed, 6 955 = 1 391 × 5
• etc.

• Preceding numbers: …1 389, 1 390
• Following numbers: 1 392, 1 393…

Nearest numbers from 1 391

• Preceding prime number: 1 381
• Following prime number: 1 399

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• 1 391 est-il un nombre premier ?