Is 1721 a prime number?

1 721 is an odd number, because it is not evenly divisible by 2.

Find out more:

• 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 1 721 is about 41.485.

Thus, the square root of 1 721 is not an integer, and therefore 1 721 is not a square number.

Anyway, 1 721 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 1 721) is the result of the product of this number (1 721) by itself (i.e., 1 721 × 1 721); the square of 1 721 is sometimes called "raising 1 721 to the power 2", or "1 721 squared".

The square of 1 721 is 2 961 841 because 1 721 × 1 721 = 1 721² = 2 961 841.

As a consequence, 1 721 is the square root of 2 961 841.

1 721 is a number with 4 digits.

The multiples of 1 721 are all integers evenly divisible by 1 721, that is all numbers such that the remainder of the division by 1 721 is zero. There are infinitely many multiples of 1 721. The smallest multiples of 1 721 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 1 721 too, since 0 × 1 721 = 0
• 1 721: indeed, 1 721 is a multiple of itself, since 1 721 is evenly divisible by 1 721 (we have 1 721 / 1 721 = 1, so the remainder of this division is indeed zero)
• 3 442: indeed, 3 442 = 1 721 × 2
• 5 163: indeed, 5 163 = 1 721 × 3
• 6 884: indeed, 6 884 = 1 721 × 4
• 8 605: indeed, 8 605 = 1 721 × 5
• etc.

• Preceding numbers: …1 719, 1 720
• Following numbers: 1 722, 1 723…

Nearest numbers from 1 721

• Preceding prime number: 1 709
• Following prime number: 1 723

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• 1 721 est-il un nombre premier ?