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7×89

7×89 denotes the product of the integers 7 and 89. The multiplication equals 623.

Both factors are primes, so 7×89 is a semiprime, the product of two primes. The prime factorization of 623 is 7×89.

89 is a Fibonacci number (the 11th) and is prime; 7 is also prime. The digit sum

As a semiprime, 623 appears in common number-theory examples illustrating factorization and the properties of products

of
623
is
11,
and
it
is
not
divisible
by
3
or
5.
In
binary,
623
equals
1001101111;
in
hexadecimal,
it
is
0x26F.
of
two
primes.
Its
small
size
means
it
has
limited
cryptographic
relevance,
but
it
provides
a
concrete
example
of
how
prime
factors
determine
a
composite
number.