Is 1661 a prime number?

1 661 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 1 661 is about 40.755.

Thus, the square root of 1 661 is not an integer, and therefore 1 661 is not a square number.

The square of a number (here 1 661) is the result of the product of this number (1 661) by itself (i.e., 1 661 × 1 661); the square of 1 661 is sometimes called "raising 1 661 to the power 2", or "1 661 squared".

The square of 1 661 is 2 758 921 because 1 661 × 1 661 = 1 661² = 2 758 921.

As a consequence, 1 661 is the square root of 2 758 921.

1 661 is a number with 4 digits.

The multiples of 1 661 are all integers evenly divisible by 1 661, that is all numbers such that the remainder of the division by 1 661 is zero. There are infinitely many multiples of 1 661. The smallest multiples of 1 661 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 1 661 too, since 0 × 1 661 = 0
• 1 661: indeed, 1 661 is a multiple of itself, since 1 661 is evenly divisible by 1 661 (we have 1 661 / 1 661 = 1, so the remainder of this division is indeed zero)
• 3 322: indeed, 3 322 = 1 661 × 2
• 4 983: indeed, 4 983 = 1 661 × 3
• 6 644: indeed, 6 644 = 1 661 × 4
• 8 305: indeed, 8 305 = 1 661 × 5
• etc.

• Preceding numbers: …1 659, 1 660
• Following numbers: 1 662, 1 663…

Nearest numbers from 1 661

• Preceding prime number: 1 657
• Following prime number: 1 663

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• 1 661 est-il un nombre premier ?