Is 999991 a prime number?

999 991 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 999 991 is about 999.995.

Thus, the square root of 999 991 is not an integer, and therefore 999 991 is not a square number.

The square of a number (here 999 991) is the result of the product of this number (999 991) by itself (i.e., 999 991 × 999 991); the square of 999 991 is sometimes called "raising 999 991 to the power 2", or "999 991 squared".

The square of 999 991 is 999 982 000 081 because 999 991 × 999 991 = 999 991² = 999 982 000 081.

As a consequence, 999 991 is the square root of 999 982 000 081.

999 991 is a number with 6 digits.

The multiples of 999 991 are all integers evenly divisible by 999 991, that is all numbers such that the remainder of the division by 999 991 is zero. There are infinitely many multiples of 999 991. The smallest multiples of 999 991 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 999 991 too, since 0 × 999 991 = 0
• 999 991: indeed, 999 991 is a multiple of itself, since 999 991 is evenly divisible by 999 991 (we have 999 991 / 999 991 = 1, so the remainder of this division is indeed zero)
• 1 999 982: indeed, 1 999 982 = 999 991 × 2
• 2 999 973: indeed, 2 999 973 = 999 991 × 3
• 3 999 964: indeed, 3 999 964 = 999 991 × 4
• 4 999 955: indeed, 4 999 955 = 999 991 × 5
• etc.

• Preceding numbers: …999 989, 999 990
• Following numbers: 999 992, 999 993…

Nearest numbers from 999 991

• Preceding prime number: 999 983
• Following prime number: 1 000 003

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• 999 991 est-il un nombre premier ?