What number am I?

I am a two-digit multiple of $50$

What number am I?

I am an even number less than $100$

One of my factors is $13$.

My digits are $1$ apart.

Tell whether number is prime (P) or composite (C)

$7$

Tell whether number $39$ is prime or composite.

$43$ is a 

$58$ is a 

Tell whether number is prime (P) or composite (C).

$69$

Tell whether $87$ is prime or composite.

Tell whether number is prime (P) or composite (C)

$97$